The late Kashio Tadao, founder of Casio Computer Co., Ltd., was born in Kureta-mura (now Nankoku City) in Kochi Prefecture, Japan, in 1917.
In 1923, after the Great Kanto Earthquake, the whole Kashio family moved to Tokyo at the invitation of an uncle working there. After graduating from high school, Tadao began working as an apprentice to a lathe operator. The factory owner recognized Tadaoĺs skill and encouraged him to begin studies at Waseda Koshu Gakko (now Waseda University), while still working at the factory. He gained experience in a variety of jobs, making pots, pans, and bicycle generator lamps, and soon earned a reputation for himself and received subcontracts to process parts. In 1946, Tadao set up his own business called Kashio Seisakujo, in Mitaka, Tokyo.