Tokyo's Museum of the Imperial Collections, Sannomaru Shozokan, has reopened in full after a major rebuild, with a special exhibition of 190 imperial treasures that runs until 24 January 2027. The show, which opened on 3 November, marks the first time objects from the Shosoin Repository have been displayed to the public inside the Imperial Palace grounds.

The museum traces its origins to 1989, when the imperial family donated paintings, calligraphy, crafts and historical materials accumulated over generations to the state. It opened in 1993, and its holdings have since grown to about 6,300 items, including 10 National Treasures and 13 Important Cultural Properties, through gifts from imperial branch families.

A new building programme began in 2019, management passed to the National Institutes for Cultural Heritage in October 2023, and a first phase opened the following month. The museum then closed in May 2025 to finish the work. The completed galleries now cover 1,280 square metres, roughly eight times the old exhibition space, with verdigris copper roofing and diamond motifs that echo the palace architecture around it.

The opening display is arranged in three rotations. The first presents masterpieces of Japanese art from the Heian to Edo periods, the Shosoin treasures, and works by the Imperial Household Artists of the Meiji era. Highlights include an 11th-century calligraphy scroll by Minamoto no Kanehiro, a 16th-century gold-leaf screen of the sun and moon, and Ito Jakuchu's phoenix painting of 1755. Later rotations will feature treasures donated by Horyuji temple and the small gift boxes known as bonbonniere.