Casio traces its origins to Kashio Seisakujo, which was founded in Mitaka, Tokyo, in April 1946. Casio Computer Co., Ltd. was established in June 1957. Casio’s corporate history also identifies Tadao Kashio as the founder of Kashio Seisakujo, the predecessor of Casio.
Casio entered the watch business in 1974 with the Casiotron. On Casio’s own history and anniversary pages, the Casiotron is described as the world’s first digital watch with an automatic calendar function. The company says this watch automatically displayed the correct month, date, and day of the week while adjusting for longer and shorter months.
Casio’s watch ranges have included G-SHOCK, BABY-G, OCEANUS, EDIFICE, and PRO TREK. On Casio watch pages, the company also presents lines such as CASIO/Vintage and MR-G.
Casio Computer Co., Ltd. lists its headquarters at 6-2, Hon-machi 1-chome, Shibuya-ku, Tokyo 151-8543, Japan. Its corporate profile identifies timepieces among its major products. The same company data page lists 8,259 employees as of March 31, 2026.
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