The treasure house was built in 1983. Artistic crafts are exhibited there. There are two rooms in the treasure house. One is for exhibition, and another is a shed. Also, you can view Shouyouen Japanese garden from the corridor. You will find this building easily because it is located on the front of stone steps reaching the Sanbutsu-doh hall.

A number of treasure is about 6,000 pieces. 48 of these have been designated as important cultural property, and one is national treasure. In addition to that, many books and diaries have been stored.

There are about 100 pieces of treasure in the exhibition room, and that matches to certain theme, which will be changed randomly. Especially, tapestries are replaced every two months.

Treasures are related to Tokugawa family, Rinnoji-no-miya priest from Imperial family, and co-existence of Shinto and Buddhism.

Buddhist altar and sutra are abundant. Also, there are many old documents, which have historical value. In addition to that, 12 constellations have been drawn on the Mandara Buddhist diagram. That diagram is called "Mandara of the Dipper."

Older treasures are put on the left side of the exhibition room, and newer treasures are put on the right side. Those are related to Priest Shoto, and harmonization of Shinto and Buddhism. You can follow the history of Nikko if you walk from the left (entrance) to the right (exit) in order.