| It was formed on March 1, 1955 by the merging of a town and five villages (Shuzan Town, Hosono Village, Utsu Village, Kuroda Village, Yamaguni Village and Yuge Village) in the southern part of Kitakuwada-gun. |
1955年3月1日に北桑田郡南部の1町5村（周山町・細野村・宇津村・黒田村・山国村・弓削村）が合併して発足。 |