About MIWA


We have persistently manufactured and marketed electric measuring instruments, electronic equipment and control equipment making it our motto "to create original products based on original technology" since our establishment. Most of our products are specified by electric power companies, our company has been registered for assessment of quality management system "ISO 9001"in 1999.

Since 1952, our Maximum/Minimum demand meter has been a major product specified by electric power companies. The further development of products such as digital meters, transducers, recorders and ground fault detector for underground cables (F.D.) by our engineers to meet the needs. Furthermore, the requirements of automation and labor saving devices for industry have earned reliance and esteem from electric companies and other users.


D-U-N-S® Number 691436646
Establishment October 27, 1944
Office Head office 34-30 Imai-minami-cho, Nakahara-ku, Kawasaki, Kanagawa, (211-0064), Japan 
Phone: +81-44-722-7131    FAX: +81-44-722-7136
URL:  https://www.miwa-denki.co.jp/
Technical Center 34-30 Imai-minami-cho, Nakahara-ku, Kawasaki, Kanagawa, (211-0064), Japan 
Phone: +81-44-733-3633    FAX: +81-44-733-8394
Chiba Factory 1665-13 Tsubaki, Sosa, Chiba, (289-2102), Japan
Phone: +81-479-73-1151    FAX: +81-479-73-1154
Capital JPY 80,000,000
Annual Turnover JPY 1,200,000,000
Number of Employee 80
President & CEO Katsumi Chiba
Bank MUFG Bank, Marunouchi Branch, Tokyo
Bank of Yokohama, Musashikosugi Branch, Kanagawa (USdollar)
Sales Items Ground Fault Detector for underground cables
Power Transducers
Analog meters
Digital meters
Target Type Fault Indicators
Test Equipments
Electro Magnetic Display Units (MAGSIGN)
ISO Certification JIS Q 9001:2015 (ISO 9001:2015)

Main customers


Tokyo Electric Power Company

Kansai Electric Power Company

Chubu Electric Power Company

Chugoku Electric Power Company

Tohoku Electric Power Company

Hokuriku Electric Power Company

Hokkaido Electric Power Company

Kyusyu Electric Power Company

Shikoku Electric Power Company

Okinawa Electric Power Company

Hitachi, LTD.

Toshiba Corporation

Mitsubishi Electric Corporation

East Japan Railway Company

Nihon Koden Corporation


TAMCO Switchgear (Malaysia)

State Electric Authority (Indonesia)

Cardiac Science Corporation (U.S.A.)

Tirathai Public Company (Thailand)

Ashida Electronics (India)