Two-thirds of the north side of the building (on the observers' right from the approach), where the Buddhist statues are placed, is architecture of the Tenpyo era (from the end of the seventh to the mid eighth centuries) and the Rai-do (worship) Hall, the south part of the building, was reconstructed around 1199 by removing the decrepit original Tenpyo architecture.
建物の北側約3分の2（参道側から見て向かって左側）の、仏像が安置されている部分が天平時代の建築で、南側の礼堂（らいどう）部分は鎌倉時代の正治元年（1199年）頃に老朽化した天平建築を取り壊し再建したものである。