A power supply device, comprising: - a contactless power supply unit for charging a battery of a vehicle by supplying power from a power transmission coil to a power reception coil in a contactless manner by means of at least magnetic coupling; - a contact power supply unit that for electrically connecting to a connection terminal of a vehicle via a cable and a connector and for supplying power to the battery of the vehicle in a contact manner; and - a power supply device side controller for controlling the contactless power supply unit and the contact power supply unit; characterized in that the power supply device side controller is configured - to continue a power supply via one power supply unit (12, 16) and to put the power supply from the other power supply unit (12, 16) on standby, (i) when a battery of a first vehicle (3, 3A) is being charged by either of the contactless power supply unit or the contact power supply unit, and (ii) when there is a request for power supply from the other power supply unit (12, 16) from a second vehicle (3, 3B), and - when the connector of the cable is connected to the connection terminal of the first vehicle (3, 3A) during the charging of the battery of the first vehicle (3, 3A) via the contactless power supply unit,- to transmit a signal for stopping the power supply by the contactless power supply unit via the contactless power supply unit, and to charge the battery of the first vehicle (3, 3A) with the power that is input to the connection terminal of the first vehicle by the contact power supply unit. - a contactless power supply unit for charging a battery of a vehicle by supplying power from a power transmission coil to a power reception coil in a contactless manner by means of at least magnetic coupling; - a contact power supply unit that for electrically connecting to a connection terminal of a vehicle via a cable and a connector and for supplying power to the battery of the vehicle in a contact manner; and - a power supply device side controller for controlling the contactless power supply unit and the contact power supply unit; - to continue a power supply via one power supply unit (12, 16) and to put the power supply from the other power supply unit (12, 16) on standby, (i) when a battery of a first vehicle (3, 3A) is being charged by either of the contactless power supply unit or the contact power supply unit, and (ii) when there is a request for power supply from the other power supply unit (12, 16) from a second vehicle (3, 3B), and (i) when a battery of a first vehicle (3, 3A) is being charged by either of the contactless power supply unit or the contact power supply unit, and (ii) when there is a request for power supply from the other power supply unit (12, 16) from a second vehicle (3, 3B), and - when the connector of the cable is connected to the connection terminal of the first vehicle (3, 3A) during the charging of the battery of the first vehicle (3, 3A) via the contactless power supply unit,- to transmit a signal for stopping the power supply by the contactless power supply unit via the contactless power supply unit, and to charge the battery of the first vehicle (3, 3A) with the power that is input to the connection terminal of the first vehicle by the contact power supply unit.