Built in: 1585 by Toyotomi Hideyoshi.
This castle was built by Toyotomi Hideyoshi when he was attacking Toyama Castle and Sassa Narimasa in 1585. It was brunch castle of Shiratori Castle. After the battle, Ecchu became the land of Maeda Toshiie, and his samurai Okajima Kazuyoshi became the lord of Yasuda Castle. However, soon, it was abandoned.
Honmaru, the first bailey, Ninomaru and right bailey and their moat are remaining in great condition. This castle is one of few castles which preserved the moat and structure in great condition. There are many relics found in this ruins, and they are displayed at the museum.