Company Profile

Our Business

We are a "comprehensive gear manufacturer" that has been producing high-precision gear products at international standards for a hundred years since our establishment. Our gears, which support essential infrastructure, are used in a wide range of fields including power generators, large mills for cement grinding, river pumps, machinery for steel and plastics production, and more. We have earned a top market share domestically as an unsung hero that supports the industrial foundation by providing the most efficient power transmission systems.

Through collaboration with the Sumitomo Heavy Industries Group's global network, our products & services have expanded into the world market.

Company Name Sumitomo Heavy Industries Gearbox Co., Ltd.
Offices Head office
4-16-1, Wakihama, Kaizuka, Osaka 597-8555, Japan


  • Kaizuka Factory:4-16-1, Wakihama, Kaizuka, Osaka 597-8555, Japan
  • Okayama Factory:8230, Tamashima-Otoshima, Kurashiki, Okayama 713-8501, Japan

Sales Office

  • Eastern Region Sales Office:26th ThinkPark Tower, 1-1 Osaki 2-chome, Shinagawa-ku, Tokyo 141-6025, Japan
  • Western Region Sales Office:9th Osaka Mitsui Bussan Building, 3-33 Nakanoshima 2-chome, Kita-ku, Osaka-shi, Osaka 530-0005, Japan
  • Hiroshima Sales Office:4th Inarimachi (Hiroshima Inarimachi NK Building), 4-1, Inari-machi, Minami-ku, Hiroshima 732-0827, Japan
Telephone Number  +81-72-431-3021
President and CEO Akihisa Miwa
Founded September 25, 1916
Products Paramax Drive, Large Industrial Gearboxes, Compower Planetary Gear Drive, Hedcon Worm Gear Reducer, SKK GearMoter, Coupling, and so on
Capital 840.67 million yen
Employees 462 (as of September 1, 2022)


  • ISO9001
  • ISO14001



  • Japan Gear Manufacturers Association
  • The Japan Society of Industrial Machinery Manufacturers
  • The Japan Society of Mechanical Engineers
  • Kinki Association of Gear Manufacturers 
  • American Gear Manufacturer's Association

Head office Map