It was originally the romon (two-storied gate) of Ibaraki-jo Castle where Sekishu KATAGIRI was born and was received by him when the castle was taken down due to Ikkoku Ichijo Rei (Law of One Castle per Province) ordered by Ieyasu TOKUGAWA.
徳川家康の発した一国一城令により取り壊された片桐石州の出生地でもある茨木城の楼門をもらい受けたものである。