The site of Toyama Castle was first fortified in 1543 by local daimyō Mizukoshi Katsushige. Taken over and expanded by Sassa Narimasa in 1581, the castle came under attack by the forces of Toyotomi Hideyoshi only four years later, following the Honnō-ji Incident. The castle was decommissioned and abandoned afterwards, then occupied and rebuilt by Maeda Torinaga in 1597. Destroyed by fire in 1609, it was reconstructed once more in 1661, after which it remained in the hands of the Maeda clan until the Meiji Restoration. While the original castle was dismantled in 1870, a ferro-concrete replica based roughly on Inuyama-jō's donjon was constructed in 1954, now serving as a local history museum.