A power receiver includes a first secondary-side resonant coil that receives electric power from a primary-side resonant coil through magnetic field resonance; a rectifier circuit that rectifies alternating-current power; a smoothing circuit; a pair of output terminals; a switch, inserted in series on a line between the rectifier circuit and the smoothing circuit, that switches a state of the line, and a drive controller that drives the switch through a first PWM drive pattern determined by a first duty cycle and a first frequency that is less than or equal to a frequency of the magnetic field resonance. The first duty cycle is set based on a first power reception efficiency of the first secondary-side resonant coil, a first rated output of a first load, a second power reception efficiency of a second secondary-side resonant coil of another power receiver, and a second rated output of a second load.