Seibu Oil Company Limited

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Basic information

BASIC

Head office: 5 Nishioki, Yamaguchi City, Yamaguchi Prefecture, Japan
Chief executive: Yoshio Nibo
Capital: 100,000,000
Employees (non-consolidated): 92 people
Employees (consolidated): 102 people
Start date: 1962-06-25
End date

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Websites

1 DOMAINS

https://www.seibuoil.co.jp/

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Business

4

Oil Storage Facility OperationsNational Stockpile OperationsSolar Power Generation BusinessNew Business (GX Western)

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Related companies

4 COMPANIES

Company name	Group	Parent	Subsidiary	Customer	Supplier	Alliance	Bank	Shareholder
i Business Partners Inc. Group
Kyoshin Industrial Co., Ltd. Group
Western Marine Service Co., Ltd. Group
Idemitsu Kosan Co., Ltd. Shareholder

Names without a link are companies not yet registered in OpenBizGraph

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Network

NETWORK

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History

21 EVENTS

1962-06-19

Western Japan Petroleum: Founders' General Meeting Held. Founders: Hideo Takeuchi and 8 others. : PHOTO

1962-06-25

Western Japan Petroleum: Founding General Meeting Held. Company name changed to Western Petroleum. Capital: 250 million yen. President: Hiroshi Tsuda appointed. Headquarters established at 2-18 Marunouchi, Chiyoda-ku, Tokyo.

1962-07-10

Headquarters location changed to 1-6-1 Marunouchi, Chiyoda-ku, Tokyo.

1962-08-10

Petroleum refining business and specific refining equipment (50,000 barrels/day): Application submitted to the Ministry of International Trade and Industry.

1964-10-06

President Hideo Takeuchi appointed.

1965-06-01

Opened a branch office in Honmachi, Onoda City.

1965-09-06

Signed a basic contract with Shell Petroleum.

1966-08-18

Negotiations with local fishing cooperatives on fishing compensation began (overview of business plan).

1967-03-03

Official approval for petroleum refining business (50,000 barrels/day).

1967-03-15

Ministry of Transport approved installation of a sea berth.

1967-05-10

Chairman Naka-ani Kanichi and President Masuda Katsuro appointed.

1967-11-15

Moved to the Ryuo Mountain base in Koshimono.

1967-12-21

Shell Petroleum invested capital.

1968-01-23

Phase 1 construction work commenced (land-based facilities).

1968-07-15

Moved the Onoda office to Nishioki, Onoda City.

1969-07-18

Fishing compensation negotiations fully resolved (sea construction commenced).

1969-08-15

Company newsletter 'Gintō' inaugural issue published : PHOTO

1969-10-01

Signed crude oil and petroleum product sales contract with Shell Oil

1969-10-28

Phase 1 construction completed (overall trial operation of onshore facilities)

1969-11-17

Commenced operations at 50,000 barrels per day : PHOTO : First onshore shipment : PHOTO

1969-12-11

Assigned lot number for Nishioki reclaimed land, changed address display (new display: 5 Nishioki, Onoda City, Yamaguchi Prefecture)

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News

3 ARTICLES

2026-10-30

Participation in the elementary school learning program 'Sustain Trecen' hosted by San'yō Onoda City and Renofa Yamaguchi

2026-06-12

Pilot Plant Installed to Establish Mass-Cultivation Technology for Marine Purple Photosynthetic Bacteria

Seibu Oil Co., Ltd. announced plans to install a pilot plant to establish technology for the mass cultivation of marine purple photosynthetic bacteria. The announcement was made on December 9, 2025, and the company outlined progress in its research and development toward 2025.

2026-06-12

Holiday Notice: June 12, 2026, in Lieu of Company Foundation Day

Seibu Oil Co., Ltd. announced that Friday, June 12, 2026, will be a holiday in lieu of its company foundation day on June 25. Employees may take the day off.

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