Omron Group was founded in 1933. Mr. Lishi Ichiro set up a small factory in Osaka called Lishi Electric Manufacturing Co., Ltd., with only two employees at that time. In addition to the initial production of timers, the company once specialized in the production of protective relays. The manufacture of these two products became the starting point of Omron Co., Ltd. In order to adapt to the development of the times, the company name and brand name were unified and changed to "Omron Co., Ltd." on the occasion of the company's 50th anniversary.

Omron Omron Group 1933 was established in Kyoto, Japan in May.