Ushiku Castle was located at the side of Ushiku Pond in Ushiku City, Ibaraki Pref. It is said to have been built by Okami Yorikatsu during the Bunei era (1532 1555). In 1586, the castle fell by the attack of the Kagaya clan. Later the Yura clan moved to this castle, but in 1621, when the Yura clan was transferred to another domain, the castle was abolished.
Surrounded by Ushiku Pond in the three directions and protected by the moat in the north, this flat land castle is presumed to have been a strong fort typical to the middle ages. All the castle area was surrounded by earthworks, which was forming a strong defense line. Inside the castle area, deep and steep earthworks bounded each of the compounds (the main, the second and the third). At present, an information board of the castle ruins is set at the north gate, inviting visitors to go back to the warring days.