In 1983, Casio engineer Kikuo Ibe designed the first G-Shock: the DW-5000C.It had a 10-year battery life, water resistance to 10 bar and was able to survive a 10 meter fall onto a hard surface (he tested 200 prototypes by dropping them from rooftops or third story windows).
The shock resistant design has 10 layers protecting the quartz timekeeping module,including aurethanerubber bumper, thestainless steelcase, the hardened mineral glass watch crystal, the stainless steel screwed down caseback, and the "floating module" where the quartz mechanism floats free in a urethane foam cradle, with the outer buttons and LCD module attached with flexible cables.
Casio released the G-Shock in April 1983, to fill the demand for durable watches. The popularity of G-Shocks increased throughout the 1990s. By 1998 Casio released over 200 G-Shock models. By then Casio had sold 19 million G-Shocks worldwide.
In 1991, Casio released the Baby-G series for women.
G-Shock Mini are 70% the size of a G-Shock, for people who have smaller wrists. They are available in Japan and can be shipped worldwide.
On September 1, 2017, Casio celebrated its 100 millionth shipment of G-Shocks worldwide.