Onoken Co., Ltd. engages in the sale, processing, import and export of steel products, ironware and construction materials. It also provides the sale of civil engineering building materials; civil engineering construction works; and leasing and sale of real estate. Its products include steel plates, steel shapes, steel bars, and construction materials. It operates through the following segments: Kyushu and Chugoku, Kansai and Chukyo, and Kanto and Tohoku. The company was founded on August 11, 1949 and is headquartered in Kitakyushu, Japan.