Power receiving device, wireless power supply system, transmission system, and automatic driving system

This power receiving device (100) contactlessly receives AC power transmitted from a power transmitting device (150), and is provided with: a power receiving unit (12) that receives AC power transmitted from a power transmitting unit (11) of the power transmitting device (150); a rectifying unit (13) that has a circuit that rectifies AC power to DC power, that is provided with a plurality of semiconductor switches (35, 36) in either an ON state or an OFF state in a part of the circuit, and that can open the output end of the power receiving unit (12) by selecting the ON state or OFF state of the plurality of semiconductor switches (35, 36); a filter unit (14) for smoothing the DC power rectified by the rectifying unit (13); a voltage detection unit (16) that detects the output voltage of the filter unit (14); and a failure determination unit (18) that determines a failure location and a failure mode of the rectification unit (13) on the basis of the output voltage from the voltage detection unit (16). 本发明的受电装