Built on a mountain ridge overhanging eastward, the castle was surrounded by its branch castle at the southern mountain ridge across a valley, Sugitani-toride Fort in the southeast, and Sugitani-jo Castle in the north.
東へ張り出した尾根の先端に築かれており、谷を挟んだ南側の尾根には望月支城、南東には杉谷砦、北方には杉谷城がある。