POWER RECEIVING DEVICE AND WIRELESS POWER TRANSFER SYSTEM

A power receiving device and a wireless power transfer system including the same for non-contact power transfer to a plurality of mobile bodies are obtained, which allow stable power transfer even when the number of power transfer targets varies. In the wireless power transfer system, electric power is transmitted from a power transmitting source in a power transmitting device to generate a high frequency voltage and a power-transmitting resonant circuit with a power transmitting coil to generate an AC magnetic flux by resonance when receiving the high frequency voltage. A power-receiving resonant circuit receives the AC magnetic flux transmitted from the power-transmitting resonant circuit and converts the AC magnetic flux into AC power. At least one compensation element cancels out a variation of an inductance of the power transmitting coil attributable to the movement of the power-receiving resonant circuit to a position where electric power can be received.