Built in: 1585 by Sakai Shigetada.
It appears in the record of 1557, and Sakai Masachika became lord of Nishio castle in 1561. In 1585, Sakai Shigetada built Tenshukaku by the order of Tokugawa Ieyasu.
In 1590, Ieyasu moved to Kanto, and Tanaka Yoshimasa ruled this castle.
In 1878, Nishio Castle was abandoned.
Museum is free.