Five bays and three entrances means that, of the five front bays, the middle three are entrances and, although it is two-storied gate, it is different from a romon gate in that it has an extension eave at the border between the lower and upper storeys.
「五間三戸」とは正面の柱間が5つ、うち中央3間が通路になっているという意味、「二重門」は2階建ての門だが、「楼門」と違い、1階と2階の境目にも軒の出をつくるものを言う。