Kamioka Castle (Kamioka-jo) was built in 1564 by Yamagata Masakage, who served under the 16th century daimyo Takeda Shingen. The castle was demolished at the end of the 17th century due to a law enacted by the ruling shogunate in Edo which stated that only one castle would be allowed per domain governed by a daimyo, but such things as stone fortresses remain as they were at the site of the castle. In 1970, the two-tiered, three-storied donjon was reconstructed. Arms and armour are displayed in the castle tower.