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Company Profile

Corporate philosophy


『 Work healthy and honestly 

Healthy〕Employees have to be.

​〔Honestly〕We work for the society.

This is the company policy of OHYA SEISAKUJYO, which passed down from the founder.  
We are aiming for the manufacturer to be able to think about the exploration of skills and environmental load based on the company policy.
We put a great importance on the making of “workpieces touched by hands” and passing down to the next generations.
All employees work together to build up this company from now on.


Yokohama factory

Hirama factory

Company Profile

​>Company name


​Head Office/Hirama Factory

363 Kamihirama, Nakaharaku, Kawasaki, Kanagawa
TEL: 044-522-6247 FAX: 044-522-6248

​ Yokohama Factory

7-22-57-8 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-0061

​>Date of Establishment

February, 1961


10 million yen


President & CEO Kenji Ohya

​>Executive officer

Chairperson  Keisuke Ohya

​>Number of employees

11 people (full-time: 6 people, part-time: 5 people)

​>Business details

Metalworking industry (High pressure hose joint, automobile parts etc.)

​>Main banks

The bank of Yokohama, Kawasaki Shinkin Bank


HIYOSHI KOGYO CO.,LTD., Nikko Electric Industry Co.,Ltd.,

​>Company History

1961: Established Limited company “OHYA SEISAKUJYO” (Founder : Motojiro Ohya)

1966: Started to produce High-pressure hose parts with Friction pressure welding.

1971: Incorporated as OHYA SEISAKUJYO Co.,Ltd.

1974: Keisuke Ohya became the second president.

1982: Increased the capital to 8 million yen

1993: Increased the capital 10 million yen

2014: Kenji Ohya became the third president.

2017: Received subsidy for manufacturing company.  Installed manpower saving machines.

2018: Participated Kawasaki Internet of Things (IoT) Lab.  Installed the data management system including heat input of welding machine.

2019: Changed to buy electricity from the plant which produces Renewable energy

2020: Acquired the certification of Low carbon technology from Kawasaki city.


■Head office/Hirama factory
Approximately 8 minutes walk from Hirama Station on the JR Nambu Line

■Yokohama factory
Approximately 18 minutes walk from Hiyoshi Station on the Tokyu Toyoko Line

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