In 1868, places dominated by Kumihama or Ikuno magistrate's office in the five provinces of Tango, Tanba, Tajima, Harima and Mimasaka, and the Hatamoto domain in Tajima and Tanba were already consolidated into Kumihama Prefecture, but as separatist movements grew in places dominated by Ikuno magistrate's office, Tajima (except a part of it), Harima, and Mimasaka areas were separated and consolidated into Ikuno Prefecture.
1868年（慶応4年）、丹後国、丹波国、但馬国、播磨国、美作国5ヶ国の久美浜代官所、生野奉行支配地および但馬、丹波の旗本領は久美浜県となっていたが、生野代官所支配地を中心に分離運動が高まり、但馬（一部除く）、播磨、美作3カ国の地域が生野県として分離され、成立した。