Kushizaki Castle is classified as a hilltop castle, and is located in Yamaguchi Prefecture. During the pre-modern age, it found itself within the borders of Nagato Province. It is associated with the Mōri clan. Dates in use: 940 - 1615.

Through fortifications had existed here for several centuries, the site was given a new lease on life in 1602 when the head of the Mōri clan established the Chōfu domain here. In 1615, the castle was decommissioned but the attached administrative offices remained in use throughout the Edo period.

The stonework of the main tower seen today appears to have been completely rebuilt using newly quarried stone. The stones are sharp, unweathered and the chiseling marks remaining from splitting the stones are not consistent with traditional techniques.

There does appear to be remnant and significant sections of stonework. Also, in the surrounding castle-town, there remain several interesting historical buildings.

Timeline

940	Fortifications were believed to have been established.
1569	It became the residential castle of Naitō Takaharu.
1602	The Chōfu domain was established with Mōri Hidemoto at its head.
1615	When the One country, one castle law was passed, the buildings of the main enclosure were decommissioned and the castle became known as a Jin'ya (Government administrative offices.)
1863	The site was decommissioned. Operations were transferred to Katsuyama Palace