How many Japanese companies are there in China now?

I don't know China, but I know some Japanese companies in Suzhou, so I can give you some references:

Panasonic Division: Panasonic Electrician, Panasonic Semiconductor, Panasonic System Technology, Panasonic Electric R&D and Toyo Radio.

Hitachi Department: Renesas Semiconductor, Hitachi Display Devices, Hitachi Wire, Hitachi Precision Technology, Hitachi Medical Devices, Hitachi Chemistry, Hitachi Metals, Nitto Denko, Hitachi Engineering Construction, Hitachi Auto Parts (New).

Fujitsu Department: Jiangsu Fujitsu (New District), Fujitsu Multimedia (Park), Fujitsu Electronics.

Mitsubishi Department: Renesas Semiconductor, Mitsubishi Chemical, Asahi Glass and Fu Ling Aluminum (New).

Yoshida Department: Yoshida Building Materials and Yoshida Precision Machinery.

Fuji: Fuji camera, Fuji camera components, Fuji Shangsan Logistics, Fuji Digital, Fuji printing plate, Fuji electronic devices (the first three are actually together).

Sumitomo Department: sumitomo mitsui banking corporation, Sumitomo Electric Wire, Sumitomo Metal, Sumitomo Electronics and Sumitomo Denso.

Mitsui series: Mitsui copper foil, sumitomo mitsui banking corporation.

Canon Department: Suzhou Canon, Canon Department.

Ai Yin system: Ai Yin building materials, Ai Yin sanitary ceramics and wormwood cleaning tools.

Yokogawa System: Yokogawa Electric Meter, Yokogawa Electric Machine.

Sanyo Department: Sanyo Energy, Sanyo Electric and Sanyo Electronics.

Yamaha Department: Suzhou Yamaha (New District) and Yamaha Engine (Park)

Plate needle system: plate needle, Japanese special glass fiber, American-Japanese film (American-Japanese film and plate needle will be formally merged in 2006)

Chiyoda Department: Chiyoda Electronics, Chiyoda Seiki.

Epson, Fukuda Metal, Takemoto Grease, Alex Electromechanical, Sony Camegao, Nippon Radio, Sun Packaging, Wang Nipu, Stanray Electric, Oxtail Motor, Shenshi Electronics, Gaoling Electronics, Hequan Electric, Sasaki Machinery, Kubota Machinery, Daikin Electromechanical Equipment, Fujikura Precision, Hirata Precision Equipment, Kuroda Chemical, and Shilian Automobile Interior. Rixing Yujin Precision Processing, Ai Peilang Cushion Plastic, Qingyuan Water Industry, Baijia Sizhou Food, Shibuya New Technology, Tama Electronics, Sun Electronics Communication, Furukawa Qi Hong Electronics, Okamoto Optics, Vitex, Smart Cote, TDK, Persimmon Metal.

References:

Suzhou hotline