A power supply apparatus, that can wirelessly supply power to a plurality of power receiving apparatuses, comprises: a plurality of antennae; and a control unit, wherein the control unit carries out control so that information pertaining to sending timings of calibration signals is sent, via the plurality of antennae, to the plurality of power receiving apparatuses; the control unit carries out control so that calibration signals sent from the plurality of power receiving apparatuses are received via the plurality of antennae; and the control unit controls an output of each antenna based on the calibration signals sent from the plurality of power receiving apparatuses so that power is supplied wirelessly to the plurality of power receiving apparatuses from corresponding ones of the plurality of antennae.