Rengeo-in temple is commonly known as Sanjusangen-do (a hall with thirty-three spaces between columns) and is administered by Myoho-in temple.

The earthquake resistant main hall is a national treasure. In the long main hall (120m long, 22m wide, 16m high) are more then one thousand Buddhist images.

The principal images of the Tendai-shu sect temple are 1001 statues of Juichimen-Senju-Sengen Kanzeon (an eleven-face one thousand-arm one thousand-eye Kan'non). Of those, a three meters high seated figure in the middle of the Buddhist deities was made by a great sculptor Tankei and is a national treasure. Of 1000 human sized standing figures, 124 were made in the 12th century when this temple was founded. The remaining 876 were made in the 13th century when the main hall was rebuilt after the original hall had been burned down. The 1000 Kan'non figures are Important cultural property.

In addition to the principal images, they have 30 more national treasures. Those are the God of Thunder and the God of Wind and 28 guardian deities who protect the Kan'nons and Buddhists who believe in Kan'non.