NOVELTY - The device has a power receiving unit (110) for carrying out electromagnetic resonance with a power transmitting unit (220) of a power transmitting device (200) to receive electric power from the power transmitting unit of the power transmitting device. A discharging unit (186) has a resistor (R10) discharging the electric power received by the power receiving unit from the power transmitting unit of the power transmitting unit when an abnormality exists in the device. An electrical storage device (190) e.g. lithium ion battery, stores the received electric power.    USE - Power receiving device for contactlessly receiving electric power from a power transmitting device or power transmitting side through electromagnetic resonance to generate running or driving force of a vehicle i.e. electric vehicle, by a driving device i.e. drive wheel, within a contactless power supply system (all claimed). Can also be used for a hybrid vehicle and a fuel cell vehicle.    ADVANTAGE - The power receiving device can allow the system to transfer the electric power through electromagnetic resonance while the abnormality exists in the power receiving, thus appropriately protecting the power receiving or power transmitting device. The resistor of the discharging unit is used to determine distance between the power receiving device and the power transmitting device to suppress an increase in the number of components, thus suppressing increase in cost of the power supply system. The system interrupts a supply of electric power to a charging mechanism of the vehicle when the abnormality exists in the charging mechanism, where the electric power remaining in the power transmitting device and the vehicle is appropriately discharged, thus appropriately protecting the charging mechanism, and hence reducing a possible influence of remaining electric power on surroundings.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a vehicle comprising a driving device    (2) a power transmitting device for contactlessly transferring electric power to a power receiving device through electromagnetic resonance comprising a power supply device    (3) a contactless power supply system for contactlessly transferring electric power through electromagnetic resonance.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of a contactless power supply system.    Resistor (R10)    Power receiving unit (110)    Discharging unit (186)    Electrical storage device (190)    Power transmitting device (200)    Power transmitting unit (220)