「副首都」、人口・経済が要件に　道府県申請で首相が指定、自維案|47NEWS（よんななニュース）

This page reports that the Liberal Democratic Party and Japan Innovation Party have drafted a bill outline for materializing the "vice capital" concept. A vice capital is defined as a prefecture that can substitute capital functions during major disasters and serve as a core of a multipolar dispersed economy. The Prime Minister designates vice capitals based on applications from prefectures meeting certain criteria regarding population and economic scale, with specific requirements to be determined by cabinet order. A promotion headquarters will be established within the cabinet, aiming to intensively promote related measures by the end of fiscal 2030, with the bill's passage sought in the current session.