On October 15, 1957, two towns and six villages were merged; they were Gojo Town, Makino Village, Kita Uchi Village, Uchi Village, Oada Village, Minami Ada Village, Nohara Town and Sakaaibe Village, in Uchi County and this did not include Minami Uchi Village.
1957年（昭和32年）10月15日南宇智村を除く宇智郡内の2町6村（五條町・牧野村・北宇智村・宇智村・大阿太村・南阿太村・野原町・阪合部村）が合併して成立。