Saigo Tsugiyori built an earthen-walled fortification in the Myodaiji area of Okazaki, near the present castle in 1455.

Matsudaira Kiyoyasu, after gaining control of the area in 1524, demolished the old fortification and built Okazaki Castle on its present location.

Following the creation of the Tokugawa shogunate, Okazaki Domain was created, and Ieyasu’s close retainer Honda Yasushige was assigned possession of the castle.

In accordance with government directives in 1873, the castle was demolished, and most of its land sold off to private individuals.

The ferroconcrete structure has three roofs and five interior floors, and contains exhibits of artifacts from the original castle, Japanese swords, armor and dioramas illustrating local history.