Since its 1966 opening, the Idemitsu has earned a reputation for excellent ceramics--the Chinese portion of which is among the most extensive to be found in Japan. The collection also includes byobu (folding screens), lacquer, painting, Chinese bronzes, scrolls, calligraphy, and tea utensils. For study and research, representative shards from various Japanese kilns are on display in a separate room. The first museum director, Sazo Idemitsu acquired this collection over a 70-year span. In addition, the Idemitsu owns more than 400 works of the French religious and expressionist painter Georges-Henri Rouault (1871-1958).