Idemitsu Kosan Co., Ltd. ("Idemitsu") hereby announces that it has approved the following personnel changes at the board meeting held on April 28, 2009. These appointments are expected to be officially approved at the 94th Annual General Meeting of Shareholders planned for June 2009 and the subsequent board meeting to be held on the same day.

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1.Changes in Representative Directors

Chairman and
Representative Director
Akihiko Tembo (current President and Representative Director)
President and
Representative Director
Kazuhisa Nakano (current Executive Vice President and Representative Director)
Retired Masakatsu Tanaka (current Executive Vice President and Representative Director)

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2.Changes in Other Officers

(1) Changes in Directors

Managing Director Yoshinori Kawamoto (current Director)
Managing Director Zenichi Suda (current Director and General Manager of Overseas Operations)
Managing Director Seiji Fukunaga (current Director and General Manager of Petroleum & Coal Marketing )

(2) New Candidates for Director

Managing Director Akiro Nishiyori (current President of Idemitsu Unitech)
Director Takashi Tsukioka (current Managing Executive Officer and General Manager of Supply and Logistics)
Director Yasunori Maeda (current General Manager of New Businesses Development)
Director Osamu Kamimae (current Executive Officer, General Manager of Energy & Mineral Resources, and President of Idemitsu Oil & Gas)

(3) New Candidate for Statutory Auditor

Outside Statutory Auditor Yohei Shiraga

(4) Officers Planning to Retire

Managing Director Atsuo Hashimoto
Director Yasuo Sakamoto
Outside Statutory Auditor Koichi Kumazaki

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3. Expected Effective Date

June 2009 (expected date for the 94th Annual General Meeting of Shareholders)

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Annex

A career summary of Kazuhisa Nakano, who is expected to be appointed President and Representative Director, is provided below.

Name: Kazuhisa Nakano

Date of Birth: January 4, 1948
Education: Graduated from Waseda University (Faculty of Commerce and Management)

Career Summary:

April 1971 Joined Idemitsu Kosan Co., Ltd.
July 1993 General Manager of General Affairs, Idemitsu Oil Co., Ltd.
October 1993 General Manager of General Affairs, Idemitsu Oil & Gas Co., Ltd.
July 1994 Director and General Manager of General Affairs, Idemitsu Oil & Gas
June 1995 General Manager of China (Hong Kong office)
July 1998 Deputy General Manager of Corporate Planning
June 2001 Managing Director, Idemitsu Oil & Gas
June 2002 President, Idemitsu Oil & Gas
April 2003 Executive Officer and General Manager of Personnel, Idemitsu Kosan
June 2004 Director and General Manager of Personnel, Idemitsu Kosan
June 2005 Managing Director and General Manager of Personnel, Idemitsu Kosan
June 2006 Managing Director, Idemitsu Kosan
June 2007 Executive Vice President and Representative Director, Idemitsu Kosan
June 2009 President and Representative Director, Idemitsu Kosan (planned)

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For inquiries regarding this press release, please contact

Ms. Iinuma
PR Section IR&PR Office
Idemitsu Kosan, Co., Ltd.
Tel: +81-3-3213-3115