It is an octagonal building in the Honkawarabuki tile-roofing style and considered to have been erected by FUJIWARA no Nakamaro to pray to the Buddha for the repose of the soul of his father, Muchimaro.
藤原武智麻呂の菩提を弔うために子の藤原仲麻呂が建立したと伝えられる本瓦葺の八角形の建物。