POWER-RECEIVING DEVICE, VEHICLE, AND NON-CONTACT POWER SUPPLY SYSTEM

A contactless power feeding system (10) includes a power transmitting device (200) including a power transmitting unit (220) and a power receiving device including a power receiving unit (110), and allows the power transmitting unit (220) and the power receiving unit (110) to electromagnetically resonate with each other to supply electric power from the power transmitting unit (220) to the power receiving unit (110) contactlessly. The power receiving device includes a power storage device (190) for storing therein the electric power received by the power receiving unit (110), and a light emitting unit (172) receiving the electric power received by the power receiving unit (110) and emitting light, and varying in brightness according to the electric power received. The electric power received by the power receiving unit (110) varies according to a positional displacement between the power transmitting unit (220) and the power receiving unit (110). The user can recognize the positional displacement between the power receiving unit (110) and the power transmitting unit (220) from information provided from an interface unit (165) relevant to the brightness of the light emitting unit (172).