Hosomi Museum was established to exhibit collections of Oriental antiquities collected by the wealthy businessman, Ryoichi HOSOMI (1901-1978: also known by the name of Ryo HOSOMI and the pseudonym Kokoan), who amassed his fortune through the trade of woollen textiles, and his eldest son, Minoru HOSOMI (1922-2006).
毛織物で財を成した実業家・細見亮市（通称：細見良、号：古香庵、1901－1978）とその長男・細見實（1922－2006）の2代が収集した東洋古美術品を展示するために開設された美術館である。