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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: +81-3-5962-3901
FAX: +81-3-3527-2116
Established onFebruary 28, 1946
Paid in capital100 million Yen
Officers President / Hideaki Fujizuka
Senior Managing Director / Toshio Miki
Director / Tomohiro Nagayama
Director / Doen Fujii
Director / Yoichi Tsusue
Auditor / Youhei Manabe
Number of employees30
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.
Major customersSony group
Meiji group
Canon group
Mitsubishi Shoji Packaging Corporation,
Nippon Becton Dickinson Company. Ltd
Meidensha group
※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.
2020 January Started development of environmentally friendly resin(MIRAI WOOD)
2023 November New head office building completed

Access to our head office

6-2, Nihonbashi Muromachi 4-chome, Chuo-ku, Tokyo 103-0022
TEL: +81-3-5962-3901 FAX: +81-3-3527-2116
【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.
4minutes-walk from A10 Exit of Tokyo Metro Ginza Line Station or Hanzomon Line Station.

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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