Okayama Prefectural Museum (岡山県立博物館 Okayama kenritsu hakubutsukan) is a museum in Okayama, Japan, built to house important artifacts from the prefecture dating from prehistory through modern times.
The museum houses one National Treasure, red-laced yoroi armor from the 12th century. Although documents about red-dyed armor lacing exist, the museum's armor is the only known example of this type of armor.[1]
The museums also houses two important tachi swords, one a National Important Cultural Property and the other an Important Cultural Property of Okayama Prefecture.[2]