‌Fact Book 2025

June 17, 2025

Idemitsu Kosan Co.,Ltd.

‌目次/Content

財務ハイライト(連結)

Financial Highlights (Consolidated)

セグメント別財務データ

Financial Data by Business Segment

連結貸借対照表

Consolidated Balance Sheets

連結損益計算書

Consolidated Statements of Income

連結キャッシュフロー計算書

Consolidated Statements of Cash Flows

事業データ

Business Data

アセットデータ(グループ製油所・化学工場・発電能力データ)

Asset Data (Refinary & Petrochemical plant & Power generation capacity)

事業セグメント

Business Segments

※注意/Note

・このファクトブックに記載している年度は、4月から翌年3月までを表記しています。ただし、事業データの石油開発および石炭に関する年度は、1月から12月までを表記しています。

・2019年4月に昭和シェル石油と経営統合をしたため、2018年度は集計可能なデータにつき両社合算の概算値を掲載しています。

・2018年度以前の出光興産単体のデータについては、WEBサイトに掲載の過去のファクトブックを参照ください。

・FY and fiscal year indicated in this fact book refer to the fiscal year from April 1 to March 31 of the following year. However, as for data about Oil exploration & production

and Coal in Business Data, indicated the fiscal year from January 1 to December 31.

・2018(E),which refers to the estimate of the total of Idemitsu Kosan and Showa Shell Sekiyu on a 100% consolidated basis,

is prepared to compare with 2019 figures as Idemitsu integrated with Showa Shell Sekiyu in April 2019.

・Fact book for FY2008-2018 is on our website. https://www.idemitsu.com/jp/ir/library/factbook/index.html

‌財務ハイライト(連結)/Financial Highlights(Consolidated)

単位/Unit

FY2018(E)

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

売上高/Net sales

百万円/million

6,866,600

6,045,850

4,556,620

6,686,761

9,456,281

8,719,201

9,190,225

営業利益/Operating income

-

(3,860)

140,062

434,453

282,442

346,316

162,185

持分法投資損益/Equity income

-

(22,358)

(39,789)

15,029

25,981

16,720

22,604

営業利益+持分法投資損益/Operating income + Equity in earnings of non-

consolidated subsidiaries and affiliates

229,100

(26,219)

100,273

449,482

308,423

363,036

184,790

経常利益/Ordinary income

-

(13,975)

108,372

459,275

321,525

385,246

214,764

親会社株主に帰属する当期純利益 /

Net income attributable to owners of the parent

94,500

(22,935)

34,920

279,498

253,646

228,518

104,055

在庫影響*①/Inventory impact

10,800

(89,300)

7,500

233,200

55,700

52,500

(29,900)

営業利益+持分法投資損益(除く在庫影響*①)/

Operating income + Equity income(Excluding inventory impact)

218,300

63,100

92,800

216,200

252,700

310,600

214,700

当期純利益(除く在庫影響*①)/

Net Income(Excluding inventory impact)

87,000

39,000

29,700

117,700

215,000

192,100

124,800

総資産額/Total assets

-

3,886,938

3,954,443

4,601,183

4,865,370

5,012,295

4,775,586

純資産/Total equity

-

1,200,564

1,215,136

1,436,512

1,629,308

1,812,531

1,737,699

有利子負債/Interest-bearing debt

-

1,336,291

1,308,858

1,364,886

1,503,397

1,342,668

1,237,001

営業活動によるキャッシュフロー/Cash flows from operating activities

-

(32,712)

170,466

146,111

(32,844)

377,391

476,742

投資活動によるキャッシュフロー/Cash flows from investing activities

-

(134,463)

(109,851)

(111,628)

70,079

(65,805)

(118,514)

財務活動によるキャッシュフロー/Cash flows from financing activities

-

157,907

(56,227)

(30,003)

(90,416)

(280,506)

(343,450)

資本的支出/Capital expenditure

-

143,036

151,414

118,798

98,688

68,137

111,362

減価償却

/Depreciation and amortization

-

94,937

98,158

104,767

104,449

99,158

95,659

1株あたり当期純利益/Net income per share

円/

-

(76.31)

117.47

940.15

853.37

170.67

77.83

1株あたり純資産/Equity per share

-

3,869

3,872

4,750

5,510

1,102

1,405

1株あたり配当金/Cash dividends per share*②

-

160

120

170

120

32(160)

36

発行済株式総数/Number of shares issued and outstanding*③

千株/thousands

-

297,864

297,864

297,864

297,864

1,392,642

1,358,079

総資産利益率/Return on total assets(ROA)*➃

%

-

(0.6)

0.9

6.5

5.4

4.6

2.1

自己資本利益率/Return on shareholders' equity(ROE)*⑤

-

(2.3)

3.0

21.8

16.8

13.4

5.9

売上高営業利益率/Operating income margin*⑥

-

(0.1)

3.1

6.5

3.0

4.0

1.8

自己資本比率/Shareholders' equity ratio*⑦

-

29.6

29.1

30.7

33.2

35.9

36.0

ネットDEレシオ/Net D/E ratio*Ⓑ

倍/times

-

1.05

1.02

0.87

0.87

0.67

0.62

EBITDA*⑨

百万円/million

-

68,719

198,431

554,249

412,872

462,194

280,448

従業員数/Numbers of employees

人/people

-

13,766

14,044

14,209

14,363

13,991

13,814

単位/Unit

FY2018(E)

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

*①在庫影響は在庫評価及びたな卸資産簿価切下の影響を含む概算値。"Inventory impact" is an estimate basis represents the impact of inventory valuation and the reduction in book value of inventory assets.

*②2024年1月1日付で普通株式1株につき5株の割合で株式分割を行いました。FY2023の括弧内数値は、株式分割を考慮しない場合の配当金。The Company conducted a 1:5 stock split on its common shares with the effective date of January 1, 2024. For FY2023, the number in the parentheses is dividend before the split

*③2023年12月31 日最終の株主名簿に記録された株主様の所有普通株式1株につき5株の割合をもって分割致しました。また、2024年3月29日に96,681,300 株を消却いたしました。Each common share owned by shareholders listed or recorded in the closing resister of shareholders on the date of December 31, 2023 was split into five shares. The company cancelled 96,681,300 shares on March 29, 2024.

*➃当期純利益/総資産(期首期末平均) Net income/Average of total assets at beginning and end of period

*⑤当期純利益/自己資本(期首期末平均) Net income/Average of shareholders' equity* at beginning and end of period

※Shareholders' equity : include total accumulated other comprehensive income (Total equity-minority interests in consolidated subsidiaries)

*⑥営業利益/売上高 Operating income/Net sales

*⑦自己資本/総資産 Shareholders' equity/Total assets

*Ⓑ(有利子負債-現預金及び有価証券)/自己資本 (Interest bearing debt-Cash and cash equivalent)/Shareholders' equity

*⑨営業利益+持分法投資損益+減価償却

/Operating income + Equity in earnings of non-consolidated subsidiaries and affiliates + Depreciation and amortization

‌FY2018(E)

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

売上高/Net sales

6,866,600

6,045,850

4,556,620

6,686,761

9,456,281

8,719,201

9,190,225

燃料油/Petroleum

5,379,700

4,820,992

3,593,399

5,219,413

7,403,861

7,080,754

7,696,391

基礎化学品/Basic Chemicals

601,800

459,227

329,044

563,526

666,889

601,574

587,195

高機能材/Functional Materials

436,300

393,837

332,592

421,437

511,006

515,377

503,366

電力再生可能エネルギー/Power and Renewable Energy

137,100

127,713

123,745

138,289

197,070

141,521

127,573

資源/Resources

308,000

241,775

171,977

338,776

672,077

370,458

265,246

-石油開発/Oil exploration and production

77,500

48,874

32,934

75,403

43,409

38,335

40,422

-石炭/Coal

230,500

192,901

139,043

263,372

628,667

332,123

224,825

その他・調整額/Others and Reconciliation*

3,700

2,304

5,860

5,319

5,376

9,514

10,452

営業利益又は営業損失/Operating income(losses)

-

(3,860)

140,062

434,453

282,442

346,316

162,185

燃料油/Petroleum

-

(76,692)

143,199

360,446

60,137

209,742

108,368

基礎化学品/Basic Chemicals

-

10,337

3,010

6,936

10,157

26,071

(9,993)

高機能材/Functional Materials

-

26,544

12,193

15,521

17,669

27,224

27,950

電力再生可能エネルギー/Power and Renewable Energy

-

(1,073)

(17,229)

(8,161)

2,074

(7,861)

(11,336)

資源/Resources

-

40,868

4,101

75,389

217,166

106,707

68,393

-石油開発/Oil exploration and production

-

17,769

6,753

36,166

19,078

8,794

9,437

-石炭/Coal

-

23,099

(2,651)

39,223

198,088

97,912

58,956

その他・調整額/Others and Reconciliation*

-

(3,845)

(5,213)

(15,680)

(24,763)

(15,568)

(21,196)

持分法投資利益又は損失/Equity in earnings of non-consolidated subsidiaries and affiliates

-

(22,358)

(39,789)

15,029

25,981

16,720

22,604

燃料油/Petroleum

-

(32,674)

(41,093)

9,249

12,883

9,910

13,747

基礎化学品/Basic Chemicals

-

1,584

391

1,235

(90)

(4,028)

2,008

高機能材/Functional Materials

-

1,884

804

1,609

(714)

349

284

電力再生可能エネルギー/Power and Renewable Energy

-

569

(75)

(1,736)

(1,593)

253

(936)

資源/Resources

-

909

628

5,625

13,733

10,241

8,961

-石油開発/Oil exploration and production

-

0

0

2,557

13,733

10,319

9,243

-石炭/Coal

-

909

628

3,067

0

(77)

(281)

その他・調整額/Others and Reconciliation*

-

5,366

(444)

(953)

1,763

(5)

(1,460)

FY2018(E)

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

セグメント利益又は損失/Segment Income(losses)

229,100

(26,219)

100,273

449,482

308,423

363,036

184,790

燃料油/Petroleum

79,800

(109,366)

102,105

369,696

73,021

219,652

122,115

基礎化学品/Basic Chemicals

50,400

11,922

3,401

8,171

10,066

22,043

(7,984)

高機能材/Functional Materials

33,200

28,429

12,998

17,131

16,954

27,574

28,234

電力再生可能エネルギー/Power and Renewable Energy

(7,500)

(503)

(17,305)

(9,897)

481

(7,608)

(12,273)

資源/Resources

88,500

41,778

4,729

81,014

230,900

116,949

77,355

-石油開発/Oil exploration and production

-

17,769

6,753

38,723

32,812

19,113

18,680

-石炭/Coal

-

24,009

(2,023)

42,290

198,088

97,835

58,675

その他・調整額/Others and Reconciliation*

(15,400)

1,520

(5,658)

(16,633)

(23,000)

(15,574)

(22,657)

資産/Assets

-

3,886,938

3,954,443

4,601,180

4,865,370

5,012,295

4,775,586

燃料油/Petroleum

-

2,549,289

2,510,048

3,077,776

3,302,173

3,423,890

3,184,944

基礎化学品/Basic Chemicals

-

337,420

347,851

409,949

391,279

384,214

342,125

高機能材/Functional Materials

-

289,493

265,906

315,014

341,722

362,006

391,695

電力再生可能エネルギー/Power and Renewable Energy

-

170,210

202,789

239,137

229,596

237,012

237,814

資源/Resources

-

378,736

341,652

328,671

430,411

301,990

287,556

-石油開発/Oil exploration and production

-

161,920

154,943

100,328

111,918

100,681

95,284

-石炭/Coal

-

216,815

186,709

228,343

318,493

201,308

192,272

その他・調整額/Others and Reconciliation*

-

161,787

286,193

230,633

170,188

303,180

331,448

減価償却費/Depreciation and Amortization

-

94,937

98,158

104,767

104,449

99,158

95,659

燃料油/Petroleum

-

53,057

57,274

58,353

63,746

58,664

52,380

基礎化学品/Basic Chemicals

-

6,013

6,141

7,123

7,272

6,743

7,215

高機能材/Functional Materials

-

8,473

7,857

9,577

9,791

8,961

10,048

電力再生可能エネルギー/Power and Renewable Energy

-

1,916

2,215

4,445

5,932

6,426

6,279

資源/Resources

-

25,012

24,119

24,538

16,756

8,445

9,797

-石油開発/Oil exploration and production

-

13,007

10,494

8,450

284

246

227

-石炭/Coal

-

12,005

13,625

16,088

16,472

8,198

9,570

その他・調整額/Others and Reconciliation*

-

463

550

726

949

9,915

9,938

FY2018(E)

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

資本的支出/Capital expenditure

-

143,036

151,414

118,798

98,688

68,137

111,362

燃料油/Petroleum

-

71,952

55,958

47,350

49,266

27,718

41,574

基礎化学品/Basic Chemicals

-

7,340

13,075

10,262

8,395

11,620

10,747

高機能材/Functional Materials

-

9,915

10,155

14,732

6,744

13,068

10,149

電力再生可能エネルギー/Power and Renewable Energy

-

17,441

32,013

10,420

12,533

3,257

13,476

資源/Resources

-

35,701

35,475

31,188

14,826

5,664

13,473

-石油開発/Oil exploration and production

-

35,701

35,475

31,188

14,826

5,664

13,473

-石炭/Coal

-

0

0

0

0

0

0

その他・調整額/Others and Reconciliation*

-

683

4,735

4,845

6,921

6,806

21,940

研究開発費/R&D expenses

-

19,436

20,468

26,016

23,640

28,821

33,915

燃料油/Petroleum

-

2,356

1,947

785

396

502

391

基礎化学品/Basic Chemicals

-

0

0

0

0

0

0

高機能材/Functional Materials

-

12,166

12,357

12,370

12,703

13,000

12,474

電力再生可能エネルギー/Power and Renewable Energy

-

538

996

1,236

258

145

139

資源/Resources

-

232

187

316

368

369

457

-石油開発/Oil exploration and production

-

0

0

0

0

0

0

-石炭/Coal

-

232

187

316

368

369

457

その他・調整額/Others and Reconciliation*

-

4,142

4,979

11,308

9,914

14,805

20,455

*その他セグメント·調整額には、消去等を含む/The figure for others and reconciliation include elimination etc.

‌FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

資産の部/Assets

3,886,938

3,954,443

4,601,183

4,865,370

5,012,295

4,775,586

流動資産計/Total current assets

1,550,288

1,665,516

2,368,088

2,732,068

2,916,843

2,649,858

現金及び預金/Cash and deposits

132,247

131,343

140,281

105,192

139,325

165,762

受取手形及び売掛金/Notes and accounts receivable, trade

593,730

602,661

870,483

841,798

919,011

817,349

たな卸資産/Inventories

622,895

694,522

1,060,205

1,308,570

1,377,865

1,266,953

その他/Other

201,416

236,990

297,117

476,507

480,640

399,792

固定資産計/Total property, plant and equipment

2,336,649

2,288,926

2,233,094

2,133,301

2,095,452

2,125,727

有形固定資産/Property, plant and equipment

1,478,122

1,521,899

1,437,810

1,390,013

1,362,581

1,374,024

無形固定資産/Intangible fixed assets

332,108

319,252

308,628

290,235

272,027

254,580

投資その他の資産/Investments and other assets

526,418

447,774

486,655

453,052

460,844

497,122

負債の部/Liabilities

2,686,374

2,739,306

3,164,670

3,236,062

3,199,763

3,037,886

流動負債計/Total current liabilities

1,648,420

1,621,286

2,061,273

2,163,986

2,192,498

2,097,407

支払手形及び買掛金/Notes and accounts payable, trade

475,664

530,697

840,834

697,307

793,760

824,413

短期借入金等/Short-term borrowings

655,565

542,314

616,043

788,684

679,386

676,495

未払金/Accounts payable, other

343,611

406,890

390,920

390,189

479,783

426,313

その他/Other

173,575

141,382

213,472

287,802

239,567

170,183

固定負債合計/Total non-current liabilities

1,037,953

1,118,019

1,103,397

1,072,076

1,007,265

940,478

長期借入金等/Long-term debt

648,133

737,468

720,767

669,233

619,056

519,879

退職給付に係る負債/Liability for employees' retirement benefit

67,542

49,232

71,648

60,351

51,793

49,064

その他/Other

322,275

331,316

310,979

342,490

336,412

371,531

純資産の部/Total Equity

1,200,564

1,215,136

1,436,512

1,629,308

1,812,531

1,737,699

株主資本合計/Total shareholders' equity

1,036,010

1,028,559

1,272,306

1,454,116

1,585,403

1,494,580

資本金/Common stock

168,351

168,351

168,351

168,351

168,351

168,351

資本剰余金/Capital surplus

461,636

461,635

460,507

451,642

390,341

354,693

利益剰余金/Retained earnings

408,064

400,579

645,330

848,910

1,037,716

1,111,225

自己株式/Treasury stock

(2,042)

(2,008)

(1,883)

(14,788)

(11,006)

(139,690)

その他の包括利益累計額/Total accumulated other comprehensive income

113,999

122,371

139,795

160,410

214,492

225,788

その他有価証券評価差額金/Unrealized gains (losses) on available-for-sale securities

1,524

5,792

3,443

3,918

5,918

4,184

繰延ヘッジ損益/Deferred gains(losses) on hedging activities, net

(7,667)

(1,209)

(5,236)

(6,431)

(4,255)

(1,014)

土地再評価差額金/Surplus from land revaluation

157,834

159,585

157,154

154,641

155,282

137,848

為替換算調整勘定/Foreign currency translation adjustments

(34,370)

(47,207)

(26,762)

(4,571)

31,652

51,873

退職給付に係る調整累計額/Defined retirement benefit plans

(3,321)

5,410

11,196

12,853

25,895

32,896

非支配株主持分/Non controlling interests

50,555

64,206

24,410

14,781

12,636

17,330

‌FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

売上高/Net sales

6,045,850

4,556,620

6,686,761

9,456,281

8,719,201

9,190,225

売上原価/Cost of sales

5,632,657

3,997,591

5,802,585

8,662,257

7,872,080

8,500,812

売上総利益/Gross profit

413,193

559,028

884,175

794,023

847,121

689,412

販売費及び一般管理費/Selling, general and administrative expenses

417,053

418,965

449,722

511,581

500,804

527,226

営業利益又は営業損失/Operating income(loss)

(3,860)

140,062

434,453

282,442

346,316

162,185

営業外収益/Non-operating income

29,300

23,392

40,324

58,631

63,522

72,747

受取利息及び配当金/Interest and dividend income

14,331

14,172

13,367

7,952

20,265

22,007

持分法による投資利益

/Equity in earnings of non-consolidated subsidiaries and affiliates, net

0

0

15,029

25,981

16,720

22,604

為替差益/Gain on foreign exchange, net

2,613

0

2,842

14,609

17,019

20,120

補助金収入/Subsidy income

7,277

4,655

3,528

3,757

2,156

2,075

その他/Other

5,077

4,564

5,555

6,330

7,359

5,938

営業外費用/Non-operating expenses

39,415

55,082

15,502

19,549

24,592

20,167

支払利息/Interest expense

13,049

11,982

11,207

15,289

20,253

16,731

持分法による投資損失

/Equity in losses of non-consolidated subsidiaries and affiliates, net

22,358

39,789

0

0

0

0

その他/Other

4,006

3,309

4,295

4,259

4,338

3,436

経常利益又は経常損失/Ordinary income(loss)

(13,975)

108,372

459,275

321,525

385,246

214,764

特別利益/Extraordinary income

22,939

15,087

26,683

75,659

15,424

13,094

固定資産売却益/Gain on sales of fixed assets

2,214

13,081

16,114

70,577

7,655

7,664

投資有価証券売却益/Gain on sales of investment securities

503

59

3,546

585

3,746

70

段階取得に係る差益/Gain from step acquisition

17,215

0

0

0

0

0

その他/Other

3,005

1,947

7,021

4,497

4,023

5,358

特別損失/Extraordinary loss

26,190

58,877

97,896

48,914

73,916

69,498

減損損失/Impairment loss on fixed assets

9,044

20,164

15,907

25,824

10,619

27,219

固定資産売却損/Loss on sales of fixed assets

428

1,121

4,246

1,457

514

3,464

固定資産除却損/Loss on disposal of fixed assets

7,870

6,863

9,752

4,824

6,842

10,292

その他/Other

8,846

30,726

67,989

16,807

55,939

28,518

税金等調整前当期純利益又は純損失/Income (loss) before income taxes

(17,226)

64,582

388,062

348,270

326,754

158,361

法人税、住民税及び事業税及び法人税等調整額/Income taxes(Current+Deferred)

3,560

29,343

111,258

97,492

99,911

56,349

非支配株主に帰属する当期純利益

/Net income (loss) attributable to noncontrolling interests

2,149

319

(2,695)

(2,868)

(1,675)

(2,043)

親会社株主に帰属する当期純利益又は親会社株主に帰属する当期純損失

/Net income (loss) attributable to owners of the parent

(22,935)

34,920

279,498

253,646

228,518

104,055

‌FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

Ⅰ営業活動によるキャッシュ・フロー/Cash flows from operating activities

(32,712)

170,466

146,111

(32,844)

377,391

476,742

税金等調整前当期純利益/Income (loss) before income taxes

(17,226)

64,582

388,062

348,270

326,754

158,361

減価償却

/Depreciation and amortization

94,937

98,158

104,767

104,449

99,158

95,659

退職給付に係る負債の増減額/Increase(decrease)in liability for employees' retirement bene

(21,172)

(20,021)

(18,677)

(12,338)

(27,089)

(16,249)

売上債権の増減額/Increase(decrease) in notes and accounts receivable, trade

111,785

(19,805)

(250,351)

61,361

(60,385)

148,469

たな卸資産の増減額/Increase(decrease) in inventories

212,591

(82,777)

(354,270)

(99,611)

(58,978)

134,470

仕入債務の増減額/Increase(decrease)in notes and accounts payable, trade

(210,465)

63,901

290,740

(171,193)

80,246

(21,581)

未払金の増減額/Increase(decrease)in accounts payable, other

(95,429)

59,129

(17,190)

(28,622)

100,409

(71,868)

法人税等の支払額/Income taxes paid

(56,835)

(7,620)

(36,696)

(74,796)

(115,334)

(94,193)

その他/Other, net

(50,900)

14,917

39,727

(160,363)

32,612

143,674

Ⅱ投資活動によるキャッシュ・フロー/Cash flows from investing activities

(134,463)

(109,851)

(111,628)

70,079

(65,805)

(118,514)

有形固定資産の取得による支出/Purchases of tangible fixed assets

(118,644)

(121,064)

(94,741)

(85,570)

(70,861)

(86,552)

有形固定資産の売却による収入/Proceeds from sale of tangible fixed assets

3,416

27,669

44,361

114,111

13,856

27,148

無形固定資産の取得による支出/Purchases of intangible fixed assets

(11,548)

(11,763)

(12,710)

(4,908)

(6,255)

(8,670)

投資有価証券の取得による支出/Purchases of investment securities

(2,122)

(1,837)

(9,462)

(2,071)

(15,575)

(29,657)

投資有価証券の売却による収入/Proceeds from sale of investment securities

5,802

2,538

5,490

30,819

8,079

214

その他/Other, net

(11,366)

(5,394)

(44,562)

17,700

4,951

(20,995)

Ⅲ財務活動によるキャッシュ・フロー/Cash flows from financing activities

157,907

(56,227)

(30,003)

(90,416)

(280,506)

(343,450)

短期借入金等の純増減額/Increase(decrease)in short-term borrowings, net

186,883

(51,850)

41,997

74,888

(100,067)

(47,918)

長期借入金等による収入/Proceeds from long-term debt

150,999

161,034

68,525

33,740

48,279

21,470

長期借入金等の返済による支出/Repayment of long-term debt

(105,202)

(124,444)

(77,670)

(112,363)

(124,293)

(93,671)

自己株式の取得による支出/Purchases of treasury stock

(13,164)

(25)

(33)

(13,091)

(57,360)

(165,320)

自己株式の売却による収入/Proceeds from disposals of treasury stock

4

59

158

319

113

136

配当金の支払い額/Cash dividends paid

(58,218)

(43,838)

(57,745)

(52,134)

(46,210)

(47,035)

その他/Other, net

(3,394)

2,839

(5,233)

(21,774)

(6,690)

(11,112)

Ⅳ現金及び現金同等物に係る換算差額

/Effect of exchange rate change on cash and cash equivalents

(879)

(3,230)

3,127

17,230

2,740

1,841

Ⅴ現金及び現金同等物の増減額

/Net increase in cash and cash equivalents

(10,149)

1,157

7,606

(35,950)

33,820

16,619

Ⅵ現金及び現金同等物の期首残高

/Cash and cash equivalents at the beginning of year

90,690

129,335

130,956

139,030

103,079

136,900

Ⅶ連結範囲の変更による現金及び現金同等物の増減額

/Net increase(decrease) in cash and cash equivalents

48,793

463

467

-

-

10,731

Ⅷ現金及び現金同等物の期末残高/Cash and cash equivalents at the end of period

129,335

130,956

139,030

103,079

136,900

164,251

‌事業データ/Business Data

1.燃料油セグメント/Petroleum

市況・為替レート/Historical market price・Exchange rate

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

為替レート(TTM)/Exchange rate(TTM)

【円/米ドル/JPY/USD】

108.7

106.1

112.4

135.5

144.6

152.6

原油価格(ドバイ)/Crude oil price(DUBAI)

【米ドル/バレル/USD/bbl】

60.3

44.5

78.1

92.5

82.3

78.5

燃料油販売量/Fuel products sales volume

【千KL/thousand KL】

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

ガソリン/Gasoline

14,119

12,764

12,711

12,870

12,597

12,355

灯油/Kerosene

3,940

4,287

3,920

3,701

3,557

3,379

軽油/Diesel oil

10,585

9,872

9,926

10,227

10,031

10,028

A重油/Heavy fuel oil A

3,335

3,316

3,267

3,286

3,135

3,135

国内主燃(小計)/Domestic 4 Core products(Sub Total)

31,979

30,239

29,824

30,084

29,321

28,897

ナフサ/Naphtha

265

305

266

374

351

648

ジェット燃料/Jet fuel*

2,531

1,372

1,729

2,366

2,502

2,409

C重油/Heavy fuel oil C*

2,304

2,128

2,551

2,700

2,359

1,792

国内燃料油(小計)/Domestic Fuel products(Sub Total)

37,078

34,045

34,370

35,525

34,532

33,747

輸出燃料油/Exported fuel products*

7,286

4,990

6,165

7,854

7,477

5,841

燃料油(合計)/Fuel products(Total)

44,364

39,035

40,535

43,379

42,009

39,588

国内需要/Domestic demand*

【千KL/thousand KL】

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

ガソリン/Gasoline

49,009

45,233

44,943

44,774

44,434

43,514

灯油/Kerosene

13,574

14,498

13,511

12,252

11,833

11,065

ジェット燃料/Jet fuel

5,109

2,782

3,462

4,654

4,897

5,119

軽油/Diesel oil

33,707

31,869

32,058

31,717

31,146

30,712

A重油/Heavy fuel oil A

10,237

10,226

10,152

10,420

9,807

9,708

C重油/Heavy fuel oil C

7,635

6,495

8,052

9,590

6,705

4,704

*出展:経済産業省/Source:Ministry of Economy, Trade and Industry

国内主燃シェア/Domestic 4 Core products share

【%】

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

ガソリン/Gasoline

28.8

28.3

28.3

28.7

28.4

28.4

灯油/Kerosene

29.0

29.4

29.0

30.2

30.1

30.5

軽油/Diesel oil

31.4

31.0

31.0

32.2

32.2

32.7

A重油/Heavy fuel oil A

32.6

32.5

32.2

31.5

32.0

32.3

国内原油処理能力・稼働❹等/Domestic refining capacity・Utilization rate

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

原油処理能力*① /Refining capacity

【千バレル/日/thousand bbl/d】

945

945

945

945

945

825

業界全体原油処理能力*②/Refining capacity in Japanese industory

3,519

3,458

3,458

3,331

3,230

3,110

原油処理量/Volume of crude oil refining

【千KL/thousand KL】

47,679

42,525

42,460

45,430

42,705

37,494

原油処理能力シェア/Share for the Idemitsu refining capacity

27%

27%

27%

28%

29%

27%

稼働率*③/Utilization rate

87%

78%

77%

83%

78%

76%

*①石油製品取引契約を締結する富士石油株式会社の原油処理能力を加えると970千バレル/日。 / 970,000 barrels/day when adding the refining capacity of Fuji Oil, Co.,Ltd with which a petroleum products trade agreement has been signed

*②出所:石油連盟「今日の石油産業データ集」より/Source:Petroleum Association of Japan(PAJ)

*③稼働率はBCDベース/ Utilization rate based on BCD

サービスステーション(SS)数/Number of servise stations(SS)*

【箇所/number】

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

SS数(出光興産)/SS under the Idemitsu brand

3,446

3,426

3,382

3,358

5,986

5,918

うちセルフSS数(出光興産)/Self-SS under the Idemitsu brand

1,300

1,349

1,392

1,422

2,528

2,560

SS数(旧昭和シェル石油)/SS under the former Showa Shell brand

2,938

2,885

2,834

2,778

-

-

うちセルフSS数(旧昭和シェル石油)/Self-SS under the former Showa Shell brand

1,063

1,070

1,086

1,093

-

-

SS数(合計)/SS(Total)

6,384

6,311

6,216

6,136

5,986

5,918

うちセルフSS数(合計)Self-SS(Total)

2,363

2,419

2,478

2,515

2,528

2,560

国内全体SS数/Total for Japan

29,637

29,005

28,475

27,963

27,414

27,414

SS数シェア/Share for the Idemitsu Servise stations.

22%

22%

22%

22%

21%

22%

*各年度の3月末時点データ/Data as of the end of March

2. 礎化学品セグメント/Basic Chemicals



市況/Historical market price

【米ドル/トン/USD/ton】

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

ナフサ価格(通関)/Naphtha price(Customs)

540

402

706

797

673

697

生産量/Production volume

【千トン/thousand ton】

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

エチレン/Ethylene

910

862

962

823

800

649

パラキシレン/Paraxylene

465

383

401

480

603

587

スチレンモノマー/Styrene monomer*

762

716

772

671

634

569

*スチレンモノマーはIdemitsu SM(Malaysia)の生産分を含む/Figures for stylene monomar include amounts producted by Idemitsu SM(Malaysia)

販売量/Sales volume

【千トン/thousand ton】

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

基礎化学品/Basic Chemicals

4,065

3,607

3,744

3,428

3,497

3,050

3.高機能材セグメント/Functional Materials

販売量/Sales volume

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

潤滑油*/Lubricants

【千KL/thousand KL】

1,192

1,089

1,183

1,152

1,136

1,098

機能化学品/Performance chemicals

【千トン/thousand ton】

620

628

759

643

672

470

*潤滑油は海外ライセンス販売先を含む/Lubricants sales volume includes sales of overseas licenses

*潤滑油販売量はシェルルブリカンツジャパン株式会社の販売量を除く/Lubricant oil sales volume excludes sales by Shell Lubricants Japan K.K.

4.電力・再生可能エネルギーセグメント/Power and Renewable Energy

販売量/Sales Volume

【百万キロワットアワー/million kWh】

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

電力小売販売量/Retail Power Sales

2,903

3,789

5,197

3,302

1,948

1,746

発電能力データ/Power generation capacity*

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

再生可能エネルギー/Renewable energy

【万キロワット/10 thousand kW】

24.2

50.0

70.7

83.6

83.6

82.9

ガス火力/Thermal power

【万キロワット/10 thousand kW】

94.2

94.1

110.5

110.5

110.5

110.5

合計(Total)

118.4

144.1

181.2

194.1

194.1

193.4

*当社保有(出資分)の発電能力合計/Power generation capacity (Figures based on share owned by Idemitsu group)

5.資源セグメント/Resources

[石油開発/Oil exploration and production ]

市況・為替レート/Historical market price・Exchange rate

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

原油価格(ブレント)/Crude oil price(BRENT)

【米ドル/バレル/USD/bbl】

64.3

41.7

70.7

101.2

82.6

80.7

為替レート/Exchange rate

【ノルウェークローネ/米ドル/NOK/USD】

8.8

9.2

8.64

9.6

10.6

10.8

為替レート/Exchange rate

【円/ノルウェークローネ/JPY/NOK】

12.4

11.4

12.78

13.7

13.3

14.1

*スポット価格の年度平均値/Fiscal year mean value of spot price is used

生産量/Production volume

【千バレル/日/thousand bbl/d】

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

ベトナム/ Vietnam

-

0.9

10.5

15.0

14.1

13.5

ノルウェー/Norway

20.9

23.1

23.3

15.6

13.8

12.4

合計/Total*

20.9

24.0

33.8

30.5

27.9

25.9

*資源開発関係会社の保有権益、持分割合ベース/Reflecting our rights and ownership ratios based on our equity share

*石油開発は、23年度以前は12月決算につき1-12月の数量。24年度は、ノルウェーは1-12月の数量、ベトナムは決算月変更により4-3月の数量/

The numbers up to FY2023 shows Jan-Dec volume as fiscal year ends in Dec The numbers for FY2024 shows Jan-Dec volume for Norway while Apr-Mar volume for Vietnam due to the fiscal year ending month change

[石炭/Coal]

市況・為替レート/Historical market price・Exchange rate

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

石炭価格/Coal price*

【米ドル/トン/USD/ton】

77.8

60.4

137.3

360.2

172.8

134.8

為替レート/Exchange rate

【米ドル/豪ドル/USD/AUD】

0.70

0.69

0.75

0.70

0.67

0.67

為替レート/Exchange rate

【円/豪ドル/JPY/AUD】

75.8

73.7

82.5

91.0

93.3

100.0

*スポット価格の年度平均値/Fiscal year average of spot price is used

生産量/Production volume

【千トン/thousand ton】

FY2019

FY2020

FY2021

FY2022

FY2023

FY2024

FY2025

FY2026

FY2027

FY2028

FY2029

マッセルブルック鉱山/Muswellbrook

1,177

985

1,090

1,130

15

-

エンシャム鉱山/Ensham

4,144

3,853

3,649

2,668

1,689

-

ボガブライ鉱山/Boggabri

4,935

5,074

5,193

4,585

5,519

5,796

豪州(小計)/Australia(Sub Total)*

10,256

9,911

9,932

8,382

7,223

5,796

マリナウ鉱山/Malinau

1,256

1,203

1,174

-

-

-

合計/Total*

11,513

11,115

11,106

8,382

7,223

5,796

*当社グループが保有する権益相当/Based on mining rights held by Idemitsu Group.

*マリナウ鉱山(ミトラバラ社)株式は21年度に売却、マッセルブルックは23年3月に終掘、エンシャムは23年8月に売却/Malinau mines in Indonesia (Mitrabara) was sold FY21.Muswellbrook was ceased in FY22. Ensham was sold in FY23

*石炭は12月決算/Fiscal years for Coal operations end in December

‌製油所データ/ Refineries ※2025年3月末時点データ/As of the end of March, 2025

国内(Domestic)

製油所名/Name

運営会社/Operating company

主要装置構成

/Main equipment configuration

設備能力/Capacity

【バレル/日/bbl/d】

所在地/Address

竣工年/Completion year

当社出資比率/Share

北海道製油所

/Hokkaido Refinery

出光興産/Idemitsu Kosan

常圧蒸留装置(CDU)

重油流動接触分解装置(RFCC)重油直接脱硫装置(RH)

140,000

33,000

42,000

北海道苫小牧市真砂町25番地1

/Tomakomai City,Hokkaido

1973

千葉事業所

/Chiba Complex

出光興産/Idemitsu Kosan

常圧蒸留装置(CDU)

重油流動接触分解装置(RFCC)重油直接脱硫装置(RH)

195,000

45,000

40,000

千葉県市原市姉崎海岸2番地1

/Ichihara City,Chiba Prefecture

1963

愛知事業所

/Aichi Complex

出光興産/Idemitsu Kosan

常圧蒸留装置(CDU)

重油流動接触分解装置(RFCC)重油直接脱硫装置(RH)

165,000

50,000

60,000

愛知県知多市南浜町11番地

/Chita City, Aichi Prefecture

1975

四日市製油所

/Yokkaichi Refinery

昭和四日市石油/Showa Yokkaichi Sekiyu

(当社連結子会社/Consolidated subsidiaries)

常圧蒸留装置(CDU)

重油流動接触分解装置(RFCC)重油直接脱硫装置(RH)

255,000

61,000

45,000

三重県四日市市塩浜町1

/Yokkaichi City, Mie Prefecture

1958

75.0%

京浜製油所

/Keihin Refinery

東亜石油/TOA Oil

(当社連結子会社/Consolidated subsidiaries)

常圧蒸留装置(CDU)

流動接触分解装置(FCC)重質油熱分解装置(FLG)

70,000

42,000

27,000

神奈川県川崎市川崎区水江町3-1

/Kawasaki City, Kanagawa Prefecture

1955

100.0%

原油処理能力(=常圧蒸留装置能力)合計/Refining capacity(=CDU capacity)Total

825,000

海外(Overseas)

製油所名/Name

運営会社/Operating company

主要装置構成

/Main equipment configuration

設備能力/Capacity

【バレル/日/bbl/d】

所在地/Address

稼働開始年/Operation start year

当社出資比率/Share

ニソン製油所

/Nghi Son Refinery

and Petrochemical complex

Nghi Son Refinery

and Petrochemical LLC

(当社持分法適用会社/Equity method affiliates)

常圧蒸留装置(CDU)

重油流動接触分解装置(RFCC)重油直接脱硫装置(RH)

200,000

80,000

105,000

ベトナム社会主義共和国タインホア省ニソン経済区

/Nghi Son District, Thanh Hoa Province,Vietnam

2018

35.1%

石油化学工場データ/Petrochemical plant ※2025年3月末時点データ/As of the end of March, 2025

国内(Domestic)

化学工場名/Name

運営会社/Operating company

主要化学品生産能力

/Main chemical production capacity

【トン/年/ton/year】

所在地/Address

竣工年/Completion year

当社出資比率/Share

千葉事業所

/Chiba Complex

出光興産/Idemitsu Kosan

エチレン/Ethylene

パラキシレン /Paraxylene

ミックスキシレン /Mix xylene

スチレンモノマー/Styrene monomer

374,000

265,000

0

210,000

千葉県市原市姉崎海岸2番地1

/Ichihara City,Chiba Prefecture

1975

愛知事業所

/Aichi Complex

出光興産/Idemitsu Kosan

エチレン/Ethylene

パラキシレン /Paraxylene

ミックスキシレン /Mix xylene

スチレンモノマー/Styrene monomer

0

357,000

170,000

0

愛知県知多市南浜町11番地

/Chita City, Aichi Prefecture

1975

徳山事業所

/Tokuyama Complex

出光興産/Idemitsu Kosan

エチレン/Ethylene

パラキシレン /Paraxylene

ミックスキシレン /Mix xylene

スチレンモノマー/Styrene monomer

623,000

214,000

0

340,000

山口県周南市新宮町1番1号

/Sunan Ciity,Yamaguchi Prefecture

1964

海外(Overseas)

化学工場名/Name

運営会社/Operating company

主要化学品生産能力

/Main chemical production capacity

【トン/年/ton/year】

所在地/Address

竣工・稼働開始年/Completion or

Operation start year

当社出資比率/Share

Idemitsu SM (Malaysia) Sdn. Bhd. Petrochemicals(Malaysia) Sdn. Bhd. Idemitsu Chemicals(M) Sdn. Bhd.

同左

/ same as on the left

(当社連結子会社/Consolidated subsidiary)

スチレンモノマー/Styrene monomer

240,000

マレーシア ジョホール州

/Johor,Malaysia

2013(竣工/Completion)

70.0%

ニソン製油所

/Nghi Son Refinery

and Petrochemical complex

Nghi Son Refinery

and Petrochemical LLC

(当社持分法適用会社/Equity method affiliates)

パラキシレン /Paraxylene

700,000

ベトナム社会主義共和国タインホア省ニソン経済区

/Nghi Son District, Thanh Hoa Province,Vietnam

2018(稼働開始年/Operation start year)

35.1%

国内/Domestic/海外/Overseas

【ギガワット/GW】

万キロワット/10 thousand kW】

太陽光/Solar power

国内/Domestic

0.187

18.7

海外/Overseas

0.514

51.4

小計(Sub Total)

0.701

70.1

バイオマス/Biomass power

国内/Domestic

0.103

10.3

海外/Overseas

0.000

0.0

小計(Sub Total)

0.103

10.3

風力/Wind power

国内/Domestic

0.020

2.0

海外/Overseas

0.000

0.0

小計(Sub Total)

0.020

2.0

地熱/Geothermal power

国内/Domestic

0.005

0.5

海外/Overseas

0.000

0.0

小計(Sub Total)

0.005

0.5

①再生可能エネルギー

/Renewable energy

国内/Domestic

0.315

31.5

海外/Overseas

0.514

51.4

小計(Sub Total)

0.829

82.9

②ガス火力

/Thermal power

国内/Domestic

0.834

83.4

海外/Overseas

0.271

27.1

小計(Sub Total)

1.105

110.5

①+②

国内/Domestic

1.149

114.9

海外/Overseas

0.785

78.5

合計(Total)

1.934

193.4

*当社保有(出資分)の発電能力合計/Power generation capacity (Figures based on share owned by Idemitsu group)

燃料油

礎化学品

高機能材

電力・再生可能エネルギー

資源

‌燃料油

礎化学品

潤滑油・機能化学品

電子材料・高機能アスファルトアグリライフ

発電(火力、太陽光、風力、バイオマス)電力卸売・販売 太陽電池パネル販売・システムインテグレーター

石油開発石炭開発地熱

Petroleum

Petroleum

Basic Chemicals

Functional Materials

Power and Renewable Energy

Resources

Basic Chemicals

Lubricants・Perfomance Chemicals

Electronic materials・Bitumen (High Performance Agri life

Power Plants(thermal,solar,wind,biomass ) Supply and sales of electricity Solar panel sales and system integrator

Oil exploration and production Coal

Geothermal resources

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Idemitsu Kosan Co. Ltd. published this content on June 17, 2025, and is solely responsible for the information contained herein. Distributed via Public Technologies (PUBT), unedited and unaltered, on June 17, 2025 at 01:07 UTC.