Company profile | KYOSEI, suppliers of gas and water piping materials, including pipes, valves, and governors

Company profile


Since our establishment in 1947, we have been committed to our long-term vision of “supporting safe and reliable social infrastructure directly connected to people’s lifelines through the manufacturing and sale of gas and water piping equipment, steel valves, governors and other products” and have been managing our business to continue to be a “company that contributes to society.”

In our ongoing medium-term management plan, we have positioned the “realization of customer needs” as a key issue and have set “strengthening product development,” “cultivating new markets, including strengthening overseas expansion” and “strengthening KEYLON’s brand power” as our priority objectives.

As a member of the Marubeni-Itochu Steel Inc. Group, we are focusing our efforts on the SDGs as well as the coming age of carbon neutrality and digitalization.

The times are changing faster than expected and the market environment for the infrastructure industry is also undergoing a period of major change. We will take this major change as an opportunity to continue to be a company that can develop products and propose solutions that satisfy our customers’ needs, and continue to take on new challenges based on our strong teamwork.

Kiyoshi Tomikawa
President of KYOSEI Corporation

Kiyoshi Tomikawa

Company Profile

Company name KYOSEI Corporation
Founded January 1, 1947
Incorporated January 26, 1949
Capital ¥100,000,000
Shareholder 100% owned by
Marubeni-Itochu Steel Inc.
Representative Kiyoshi Tomikawa
Head offices

Osaka Head Office
3-1-3, Chiyozaki, Nishi-ku, Osaka-shi, Osaka
Access to Osaka Head Office

Tokyo Head Office
KDX Hamacho Nakanohashi Building 6F, 2-14-5, Nihonbashi Kakigara-cho, Chuo-ku, Tokyo
Access to Tokyo Head Office

Plants Narita Shibayama, Nagano, Hashimoto, Harima
Branches Nagoya, Osaka, Fukuoka
Sales offices 11 locations in total: Hokkaido (Sapporo), Tohoku (Sendai), Niigata, Kitakanto (Sakura City), Kanagawa (Ayase), Hokuriku (Kanazawa), Okayama, Hiroshima, Shikoku (Matsuyama), Kitakyushu, Minamikyushu (Kagoshima)
Regional office Shizuoka
Number of employees 352 (male 289, female 63) (as of March 31, 2022)
Annual sales ¥14,400,000,000 (for fiscal year ended March 2022)
Fiscal year-end March 31 (once a year)
Main financing bank Mizuho Bank, Ltd.
Products Steel pipe with its outer surface coated with rigid PVC and lining steel pipe and Fittings
Stainless flexible pipes, metal flexible pipe fittings and PE valves
Gas valves, governors and steel valves
Business lines Production and sales of KEYLON series products; production and sales of gas valves, governors, steel valves and PE valves; sales of gas and water piping materials; sales of housing equipment; and trade of related products
KYOSEI Group KYOSEI Engineering Co., Ltd.