The main hall is a Japanese-style Buddha hall with Irimoya-zukuri (half-hipped) roof covered with cypress bark shingles, and is designated a national treasure as a typical Tendai Buddha hall in the Medieval period.
入母屋造、檜皮葺（ひわだぶき）の和様仏堂で、中世天台仏堂の代表作として国宝に指定されている。