Region
Kanto (Tokyo area) Semiconductor Region
Most Japanese semiconductor companies have their head offices in Tokyo, but the Kanto region around it is also a production base. Renesas's Naka factory in Ibaraki is its most advanced in-house logic line, Advantest builds testers in Gunma, and Tokyo Seimitsu makes probers and dicing machines in Tsuchiura.
- Fabs1
- Other company sites14
- Prefectures4
Overview
Materials makers are spread across the region: Shin-Etsu Chemical has wafer plants in Gunma and Ibaraki, Resonac has sites in Ibaraki and Chiba, and JSR has a plant in Chiba and research in Tsukuba. In Kanagawa, Ebara develops CMP systems in Fujisawa, ULVAC is based in Chigasaki and TOK runs its main operations in Samukawa.
Fabs and company sites in Kanto (Tokyo area), by prefecture
Ibaraki
8
Kanagawa
3
Gunma
2
Chiba
2
Fabs
- Naka Factory Hitachinaka, IbarakiRenesas Electronics · Microcontrollers and SoCs
Renesas's most advanced in-house logic line (40 nm); finer nodes are made at foundries.
Equipment, materials and other company sites
- Advantest: Gunma factory (Oura, Gunma)Automated test equipment (ATE) for SoC and memory
- Ebara: Fujisawa site (Fujisawa, Kanagawa)CMP systems, dry vacuum pumps and exhaust treatment
- Tokyo Seimitsu (ACCRETECH): Tsuchiura plant (Tsuchiura, Ibaraki)Wafer probers, dicing and grinding machines, metrology
- Shin-Etsu Chemical: Isobe plant (Annaka, Gunma)Silicon wafers, photoresists and photomask blanks
- Shin-Etsu Chemical: Kashima plant (Kamisu, Ibaraki)Silicon wafers, photoresists and photomask blanks
- JSR: Chiba plant (Ichihara, Chiba)Photoresists and semiconductor materials
- JSR: Tsukuba research (Tsukuba, Ibaraki)Photoresists and semiconductor materials
- Tokyo Ohka Kogyo (TOK): Sagami and Shonan operations (Samukawa, Kanagawa)Photoresists and high-purity process chemicals
- Resonac: Yamazaki site (Hitachi, Ibaraki)CMP slurries, packaging materials and SiC epitaxial wafers
- Resonac: Shimodate site (Chikusei, Ibaraki)CMP slurries, packaging materials and SiC epitaxial wafers
- Resonac: Goi site (Ichihara, Chiba)CMP slurries, packaging materials and SiC epitaxial wafers
- Renesas Electronics: Naka factory (Hitachinaka, Ibaraki)Microcontrollers, automotive SoCs, analog and power chips
- LINTEC: Tsuchiura Plant (Tsuchiura, Ibaraki)Dicing and backgrinding tapes, tape processing equipment
- Nippon Thompson (IKO): Kamakura Plant (Kamakura, Kanagawa)Linear motion components and precision positioning tables
Sources
Semiconductor regions of Japan
Last updated: October 22, 2026