Abstract: An administration apparatus is provided for reservation of a shared vehicle that administrates usage reservations of shared vehicles for the convenience of users. A control unit 11 in a control room 1 accepts an application for reservation time applied for by a user 3 via a mobile phone terminal 4, and then, according to the division of the minimum time unit of the reservation setting time, confirms the available time from one unit before that including the present time, displays it, and confirms whether there is an empty vehicle in a departure port or not with reference to a port master 15 and a reservation master 17. Then, the control unit 11 determines whether the usage start unit input by the user 3 is a unit in the future relative to the present time, including a leading buffer time of the unit, or not. In the case where the usage start unit is a future unit relative to the present time including the leading buffer time, this executes normal usage reservation.