It is a rare structure among the buildings built in the Nara period from the points that it was built in the place other than Heijo-kyo or Ikaruga and that the year of construction has been almost identified.
平城京および斑鳩以外の地区にある奈良時代建築として稀有のものであり、建立年次がほぼ特定できる点でも貴重な建築である。