Mōri Museum opened in Hōfu, Yamaguchi Prefecture, Japan, in 1966. It occupies part of the Former Mōri Clan Main Residence, dating from the Meiji and Taishō periods, of which twelve component structures have been jointly designated an Important Cultural Property and the gardens a Place of Scenic Beauty. The collection of some twenty thousand objects includes four National Treasures, nine Important Cultural Properties, and nine Prefectural Cultural Properties.