VEHICLE POWER SUPPLY DEVICE

Provided is a vehicle power supply device which prevents confusion and erroneous recognition by allowing a user to clearly determine whether a battery is being charged or is being discharged to supply electricity to an electric device. A vehicle power supply device including a battery and mounted in a vehicle capable of traveling by using a motor as a drive source comprises: an external charging terminal used to charge the battery from an external power supply or an external charger; an external output terminal used to discharge the battery to supply electricity from the battery to an electric device; and a mark display unit configured to display a charging mark 2 indicating that the battery is being charged and a discharging mark 3 indicating that the battery is being discharged to supply electricity to the electric device. The charging mark 2 and the discharging mark 3 each have a shape resembling a plug and include terminals 2a and terminals 3a pointing in opposite directions.