| In 1940 Tosho-Chosonsei in the Izu Island chain was shifted to the regular town and village system, and Aogashima Village was established in the Aogashima island under the regular town and village system at the same time. |
1940年（昭和15年）伊豆諸島の島嶼町村制が普通町村制に移行、同時に青ヶ島に普通町村制による青ヶ島村を設置。 |