A ground-side coil unit is provided with: a magnetic material plate disposed adjacent to a power transmission coil that transmits electric power to a power reception coil in a wireless manner; and a first filter coil disposed facing the power transmission coil with the magnetic material plate interposed therebetween. The first filter coil is disposed in a position where a magnetic flux generated by the first filter coil cancels out a magnetic flux generated by the power transmission coil in the magnetic material plate.