Showa Denko
The following companies operate factories in Oita: Toshiba Corporation, Nippon Steel Corporation, Canon Inc., Texas Instruments Inc., Sony, Daihatsu Motor Co. Ltd., Showa Denko K.K., Kawasumi Laboratories Inc. (), CKK, Asahi Kasei Medical Co. Ltd.（旭メディカル）, NEC Corporation, Matsushita Electric Industrial Co., Sumitomo Chemical Co. Ltd, Mitsui E&amp;S Corporation.