Affiliated companies

PSK Co., Ltd.

Address:Shoei Nihonbashi Honcho Bldg. 3-8-5 Honcho, Nihonbashi, Chuo-ku, Tokyo 103-0023 Japan


PSK plans, designs, manufactures, sells and leases construction equipments and materials. PSK provides service including engineering, operation and utilization of equipments using its specialized resources.

Newtech Kowa Corporation

Address:2-1-3 Higashitabata, Kita-ku, Tokyo 114-0013 Japan


Newtech Kowa provides comprehensive maintenance and renewal of structure including survey, diagnosis, design and construction works such as strengthening, replacement, retrofit and deterioration prevention.

PS Concrete Co., Ltd.

Address:Harumi center Bldg. 3F, 2-5-24, Harumi, Chuo-ku, Tokyo 104-8215, Japan


PS Concrete inherits technology and know-how of P. S. Mitsubishi's long time experience and provides a variety of quality prestressed precast concrete products at its specialized factories.

Ryoken Corporation

Address:2-1-3 Higashitabata, Kita-ku, Tokyo 114-0013 Japan


Ryoken Corporation provides a variety of services including sale and lease of construction equipments and materials, real estate , insurance brokerage and travel agency business. It backs up the group's business.

Ryoken Kiso Co., Ltd.

Address:NK Bldg. Shin-Otsuka, 5-7-12 Otsuka, Bunkyo-ku, Tokyo 112-0012 Japan


Ryoken Kiso is a foundation engineering and construction company. Ryoken Kiso pursues new development and environmentally friendly methods including "Tsubasa Plie" and "HYSC Pile".


Jl. Raya Cikarang Cibarusah No. 99 Sukaresmi - Cikarang Selatan Bekasi 17550 Indonesia


PT. KOMPONINDO BETONJAYA (KOBE) is the company providing manufacturing and sales services of prestressed concrete. Various precast products including PC pile, PC corrugated sheet, and U-shaped girder are introduced in Indonesia by the company. Since its establishment more than 20 years ago, KOBE has been significantly contributing to infrastructure development of Indonesia and the neighbouring countries.