JAPAN

Headquarters	2-4-3 Tonyamachi, Takasaki-shi, Gunma-ken 370-0006
Oyama office	3-13-10 Higashijyonan, Oyama-shi, Tochigi-ken 323-0829
Nagano office	122-1 Shimoshiojiri, Ueda-shi, Nagano-ken 386-0043
Saitama office	1491-1-16 Suneori, Tsurugashima-shi, Saitama-ken 350-2213
Ota office	110-2 Ookubocho,Ota-shi,Gunma-ken 379-2306
Nagaoka office	5-4957 Sekiharaminami, Nagaoka-shi, Niigata-ken 940-2039
Koriyama office	36-1 Sumizome, Tomitamachi, Koriyama-shi, Fukushima-ken 963-8041
Hitachi office	No. 102, 1-10-15 Okubomachi, Hitachi-shi, Ibaraki-ken 316-0012
Engineering center	110-2 Ookubocho,Ota-shi,Gunma-ken 379-2306

Overseas

SEIDENSHA Hong Kong Co., Ltd.	ROOM NO.6, 5/F., INTERNATIONAL PLAZA, 20 SHEUNG YUET ROAD KOWLOON BAY, HONG KONG.

SEIDENSHA VIETNAM CO.,LTD.	ROOM,17FLOOR,VIT TOWER 519 KIM MA STREET,NGOC KHANH WARD,BA DINH DISTRICT,HA NOI,VIET NAM

Partner company

WUXI MAICE Co., Ltd.	8-908-2 Tianshan Road, Wuxi New District, Jiangsu 214028 CHINA

Affiliated company

SEIDEN KOGYO Co.,Ltd	571-9 Kamitoyookamachi, Takasaki-shi, Gunma-ken 370-0871
Seiden Semiconductor Co., Ltd.	571-9 Kamitoyookamachi, Takasaki-shi, Gunma-ken 370-0871
Seiwakosan Ltd.	2-4-3 Tonyamachi, Takasaki-shi, Gunma-ken 370-0006