PARKING POSITION DETERMINATION DEVICE

A parking position determination device determines a parking position of a vehicle parked for power supply in a parking lot including a first parking space provided with a first power supply facility having a data communication function that provides update data for software of an in-vehicle ECU to the vehicle, and a second parking space provided with a second power supply facility that does not have the data communication function. The parking position determination device includes a necessity determination unit that determines whether software update is necessary, and a parking position determination unit that determines the first parking space as the parking position of the vehicle when determination is made that the software needs to be updated, and determines the second parking space as the parking position of the vehicle when determination is made that the software does not need to be updated.