The Urado castle tower ruins from the Azuchi-Momoyama period are located in the north-east corner of the Urado Castle.
The ruins, rare for a medieval mountain castle, are 7m higher than Tsumenodan and trapezoidal in shape, with the upper part measuring 11m east-west by 15m north-south.
There are two small shrines, one in front for Shiro Hachiman and one behind for Oyamatsumi.
On the slope of the castle tower, there are exposed stones, believed to be remnants of the stone wall.
Part of the northern slope was cut away during the construction of an observatory in 1958.
The old castle of Urado is described in the book "Kaizanshu" written by Akitsura Matsunoo in the early Meiji period (1868-1912).
It illustrates the remains of a castle tower of five rooms and four sides.
Fragments of round tiles and tiles bearing family symbols (shachi), used to decorate the roof‐ridge, have been found nearby, which suggests that under the reign of Toyotomi clan, the Chosokabe clan built a large scale castle to control the territory.
