Business Locations (Maps are available)：Company

Headquarters and Yokohama Works: 1 Taya-Cho, Sakae-ku, Yokohama-shi, Kanagawa 244-8589, Japan
TEL + 81 45-853-7100
FAX +81 45-852-7922

Maps are available
Tokyo Office: 14th Floor, Shibaura Rune-site Tower
3-9-1 Shibaura, Minato-ku, Tokyo 108-8539, Japan
TEL +81 3-6722-3560
FAX +81 3-6722-3561
Maps are available
Kansai Office: Sumitomo Building
4-5-33 Kita-Hama, Chuo-ku, Osaka-shi, Osaka 541-0041, Japan
TEL +81 6-6229-8551
FAX +81 6-6227-9580
Maps are available

Saitama Works: 4125 Sakitama, Gyoda-shi, Saitama 361-8604, Japan
TEL +81 48-559-2151
FAX +81 48-559-2162
Maps are available
Shonan Works: 1-5-1 Shimomachiya, Chigasaki-shi, Kanagawa, 253-0087 Japan.
TEL +81 467-85-4881
FAX +81 467-59-1095
Maps are available
Suwa Works: 11211 Ochiai, Fujimi-machi, Suwa-gun, Nagano, 399-0214, Japan
TEL +81 266-62-3155
FAX +81 266-61-1015
Maps are available

SEI Optifrontier is a comprehensive manufacturer of optical network products, optical modules and high-precision processing parts.