The Mitsui Memorial Museum is a museum that exhibits and preserves the excellent works of art from Japan and the Orient that the Mitsui family has collected for over 350 years since the Edo period. Its predecessor was the annex of Mitsui Bunko in Nakano Ward and was relocated and opened in 2005 in Nihonbashi, which is closely related to the Mitsui family and Mitsui Group. The Mitsui Main Building, where the museum is located, is a heavy Western-style building that represents Japan in the early Showa period and is designated as an important cultural property of Japan. In the exhibition room, we are trying to rediscover the traditional “beauty of modelling” through Japanese and Western styles, such as recreating the interior of the national treasure tea room “Nyoan” while taking advantage of the magnificent atmosphere at the time of construction.