Idemitsu Kosan Co., Ltd., Japan's second largest oil refiner, is named after its founder, Sazou Idemitsu.
The company has a nationwide network of 23 overseas offices, 22 domestic offices, and 7,000 service stations. The Idemitsu group's primary activities are the securing of oil resources, crude oil refining, and petroleum product marketing. The group also has interests in alternative energy sources such as coal, uranium, and geothermal generating, as well as petrochemicals and related fields.
The Petroleum Product segment is engaged in the import, refining and wholesale of petroleum products, the transportation and storage of crude oil and petroleum products, the manufacture and sale of lubricant, and the sale of service station (SS)-related products.
The Petrochemical Product segment manufactures and sells petrochemical products.
The Resource segment is involved in the research, exploration, development and sale of petroleum resources, coal, uranium and geothermal resources.
The Others segment is engaged in the import, purchase and sale of liquefied petroleum (LP) gas, the manufacture and sale of electronic materials, the provision of insurance agency and credit card services, among others.