A non-contact power supply apparatus includes a power receiving coil and transmits and receives power in a non-contact manner through magnetic coupling between the power receiving coil and a power transmitting coil included in a ground-side unit. The non-contact power supply apparatus includes: a remaining power detecting part configured to detect the remaining power of a battery; a charge start determining part configured to determine whether or not to start a charge operation of the battery, based on whether or not the remaining power of the battery detected by the remaining power detecting part is equal to or less than a charge start threshold; and a charge controlling part configured to start the charge operation if the charge start determining part determines that the charge operation is to be started.