A wireless power transfer device for wireless power transmission, the wireless power transfer device comprising: a power reception unit for receiving electric power; and a power transmission unit including a power transmission coil adapted to supply power to the power reception unit, wherein the power reception unit comprises: a plurality of power reception coils (111a-c) arranged in a circumferential direction of a shaft and symmetrical to an axis of the shaft and configured to receive electric power by magnetic coupling with the power transmission coil of the power transmission unit; a load coil disposed close to the power reception coils, and a plurality of series resonant circuits adapted to resonate at a frequency equal to a power transmission frequency and constituted by each of the plurality of power reception coils and a resonance capacity (113a-c), wherein the plurality of series resonant circuits are connected in series in a loop shape, wherein the load coil is adapted to extract received electric power from the series resonant circuits; wherein the power transmission unit comprises a series resonant circuit configured by the power transmission coil and a resonance capacity, an amplifier adapted to amplify a power transmission signal having a predetermined frequency, and a filter adapted to remove a high frequency component downstream of the amplifier, wherein the power transmission unit is adapted to generate electric power to be transmitted having a frequency equal to a resonant frequency of the series resonant circuit by the amplifier and the filter, wherein the power reception unit includes a rectifier circuit connected to the load coil via a matching circuit, and a power supply circuit adapted to convert an output of the rectifier circuit; and wherein the power transmission coil is formed in an arc shape in a circumferential direction of the shaft, and a circumferential length of the power transmission coil outside of the power reception coils is equal to or less than a half cycle in the circumferential direction of the shaft. a power reception unit for receiving electric power; and a power transmission unit including a power transmission coil adapted to supply power to the power reception unit, wherein the power reception unit comprises: a plurality of power reception coils (111a-c) arranged in a circumferential direction of a shaft and symmetrical to an axis of the shaft and configured to receive electric power by magnetic coupling with the power transmission coil of the power transmission unit; a load coil disposed close to the power reception coils, and a plurality of series resonant circuits adapted to resonate at a frequency equal to a power transmission frequency and constituted by each of the plurality of power reception coils and a resonance capacity (113a-c), a plurality of power reception coils (111a-c) arranged in a circumferential direction of a shaft and symmetrical to an axis of the shaft and configured to receive electric power by magnetic coupling with the power transmission coil of the power transmission unit; a load coil disposed close to the power reception coils, and a plurality of series resonant circuits adapted to resonate at a frequency equal to a power transmission frequency and constituted by each of the plurality of power reception coils and a resonance capacity (113a-c), wherein the plurality of series resonant circuits are connected in series in a loop shape, wherein the load coil is adapted to extract received electric power from the series resonant circuits; wherein the power transmission unit comprises a series resonant circuit configured by the power transmission coil and a resonance capacity, an amplifier adapted to amplify a power transmission signal having a predetermined frequency, and a filter adapted to remove a high frequency component downstream of the amplifier, wherein the power transmission unit is adapted to generate electric power to be transmitted having a frequency equal to a resonant frequency of the series resonant circuit by the amplifier and the filter, wherein the power reception unit includes a rectifier circuit connected to the load coil via a matching circuit, and a power supply circuit adapted to convert an output of the rectifier circuit; and wherein the power transmission coil is formed in an arc shape in a circumferential direction of the shaft, and a circumferential length of the power transmission coil outside of the power reception coils is equal to or less than a half cycle in the circumferential direction of the shaft.