A carsharing system includes circuitry configured to: receive, from a user, a usage request for requesting a reservation for use of a vehicle which is supplied for a vehicle rental service; permit the reservation for use of the vehicle when the reception unit receives the usage request and no reservation for use of the vehicle has been made at time of receiving the usage request; and give, when the reservation for use of the vehicle is determined, a permission for locking or unlocking by using electronic information to the user at a date and a time on which the vehicle is used.