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For more than 70 years since the foundation of the company, we have tried to capture the needs in the market, and we have continued to challenge in developing new business fields.

Outline of company

Company nameRyoka Sangyo Co., Ltd.
Head office location6-2, Nihonbashi Muromachi 4-chome, Chuo-ku, Tokyo 103-0022
TEL: +81-3-3245-7711
FAX: +81-3-3279-3247
Established onFebruary 28, 1946
Paid in capital100 million Yen
Officers Chairman / Kazuo Momose
President / Michitaka Mukohara
Managing Director / Toshio Miki
Director / Shigeyuki Asakuma
Director / Tomohiro Nagayama
Auditor / Youhei Manabe
Number of employees40
Business itemsSales of plastic products, magnets, mercury, industrial material, batteries, and automatic equipment.
BankersMUFG Bank, Ltd.
Sumitomo Mitsui Banking Corporation
Aichi Bank
Miyazaki Bank
Affiliated companiesRyoka Kogyo Co., Ltd.
Ryoka Tech Co., Ltd.
Nichiden Kogyo Co., Ltd.
Ryoka Sangyo(H.K.)Ltd.
Major customersSony group
Meiji group
Canon group
Mitsubishi Shoji Packaging Corporation,
Nippon Becton Dickinson Company. Ltd
※Without title, and in arbitrary order.
Major suppliersRyoka group
Shin-Etsu Chemical group
GS Yuasa group
Inabata & Co., Ltd.
※Without title, and in arbitrary order.


1946 February Established with the paid in capital of 150,000 yen
1951 June Establishment of Ryoka Nenryo (currently Ryoka Tech)
1960 December Establishment of Ryoka Kogyo
1965 January Participation in the management of Nichiden Kogyo
1971 September Capital increased to 100 million yen
1977 April Distributor of Mitsubishi Kasei(currently Mitsubishi Chemical)
1988 September Establishment of Ryoka (Malaysia) Sdn. Bhd.
1995 June Establishment of Ryoka Sangyo (H.K.) Ltd.

Access to our head office

6-2, Nihonbashi Muromachi 4-chome, Chuo-ku, Tokyo 103-0022
TEL: +81-3-3245-7711
FAX: +81-3-3279-3247
[Kanda Station]

[Shin Nihonbashi Station]
[Mitsukoshi-mae Station]
5 minutes-walk from South Exit of JR Yamanote Line or Keihin-Tohoku Line.
7 minutes-walk from Tokyo Metro Ginza Line station.
3 minutes-walk from No.4 exit of JR Sobu Line Rapid station.
4 minutes-walk from A10 exit of Tokyo Metro Ginza Line station or Hanzomon Line sation.

arrowCompany profile

Manufacturing and sales of plastic injection molding products.

Ryoka Kogyo Co., Ltd.

Manufacturing and sales of various automation control devices.

Nichiden Kogyo Co.,Ltd.

Sales of air conditioner, design, installation and maintenance of air conditioning facilities.

Ryoka Tech Co.,Ltd.

Manufacturing and sales of plastic injection molding products.

ryoka malaysia