he back gate was built in 1823.
It is said that the door of the gate was made before 1823.

In the battle between Hideyoshi Toyotomi and the Hojyo family who had made an expedition to the Kanto in 1590 (the Odawara attack), the Egawa House, which was the fortress of Nirayama Castle, was also attacked.
The numerous remains of shoots and arrowheads at that time remain on the door.

You can sense the intensity of attack at the time.