Although it is unknown when the castle was built, according to an old book "Taiheiki" (The Record of the Great Peace), Ujiyori ROKKAKU barricaded himself inside the castle preparing for an attack from Akiie KITABATAKE who belonged to the Southern Court (the Yoshino Court) in the period of the Northern and Southern Courts, the castle had already been built at that time.
正確な築城年代は定かではないが、古典『太平記』には、南北朝時代(日本)のに、南朝（吉野朝廷）側の北畠顕家軍に備えて六角氏頼が篭もったという記述があり、そのころには築かれていたと考えられている。