Yonago Castle was a castle in Yonago, Tottori, Japan. The actual site sits atop a mountain that strategically looks over Yonago's main river and its connection to the sea. When it was finally completed, the structure was a five-story castle, and it was the largest castle in the San'in area. In 1467, a fort was constructed by Yamana Muneyuki on Mt Iinoyama, just east of where Yonago Castle is presently located. However, the first actual castle was constructed on the siteby Kikkawa Hiroie. In 1601 major upgrade works on the castle were completed, including a 5-layer tower.