A contactless power transmission system comprising: a power reception apparatus; and a power transmission apparatus (A') that transmits power contactlessly to the power reception apparatus, wherein: the power transmission apparatus (A') includes: a high-frequency power source device that outputs a constant high-frequency current; and a plurality of power transmission units (21, 22, 23) that are connected to each other in series and each include a power transmission coil (Lt1, Lt2, Lt3) and a resonance capacitor (Ct1, Ct2, Ct3) connected in series to the power transmission coil (Lt1, Lt2, Lt3), the power reception apparatus includes a plurality of power reception units (31, 32, 33) respectively associated with the plurality of power transmission units (21, 22, 23), outputs of the plurality of power reception units (31, 32, 33) are connected in parallel and are output to a single load, the plurality of power reception units (31, 32, 33) each include: a power reception coil (Lr1, Lr2, Lr3) magnetically coupled to the power transmission coil (Lt1, Lt2, Lt3) of a corresponding power transmission unit (21, 22, 23); and a second resonance capacitor (Cr1, Cr2, Cr3) connected to the power reception coil (Lr1, Lr2, Lr3), in each of the power reception units (31 32, 33), the power reception coil (Lr1, Lr2, Lr3) and the second resonance capacitor (Cr1, Cr2, Cr3) are connected in parallel, the load is a power storage device, and the power reception apparatus supplies received power to the power storage device, the power reception apparatus transmits charge voltage information of the power storage device to the control unit of the power transmission apparatus (A'), the control unit of the power transmission apparatus (A') switches all of the switches (61, 62, 63) to conduction state based on the charge voltage information, and the power transmission apparatus (A') further includes: switches (61, 62, 63) that are respectively connected in parallel with the power transmission units (21, 22, 23) between input terminals; and a control unit configured to switch the switches (61, 62, 63) between an open state and a conduction state. a power reception apparatus; and a power transmission apparatus (A') that transmits power contactlessly to the power reception apparatus, the power transmission apparatus (A') includes: a high-frequency power source device that outputs a constant high-frequency current; and a plurality of power transmission units (21, 22, 23) that are connected to each other in series and each include a power transmission coil (Lt1, Lt2, Lt3) and a resonance capacitor (Ct1, Ct2, Ct3) connected in series to the power transmission coil (Lt1, Lt2, Lt3), the power reception apparatus includes a plurality of power reception units (31, 32, 33) respectively associated with the plurality of power transmission units (21, 22, 23), outputs of the plurality of power reception units (31, 32, 33) are connected in parallel and are output to a single load, the plurality of power reception units (31, 32, 33) each include: a power reception coil (Lr1, Lr2, Lr3) magnetically coupled to the power transmission coil (Lt1, Lt2, Lt3) of a corresponding power transmission unit (21, 22, 23); and a second resonance capacitor (Cr1, Cr2, Cr3) connected to the power reception coil (Lr1, Lr2, Lr3), in each of the power reception units (31 32, 33), the power reception coil (Lr1, Lr2, Lr3) and the second resonance capacitor (Cr1, Cr2, Cr3) are connected in parallel, the load is a power storage device, and the power reception apparatus supplies received power to the power storage device, the power reception apparatus transmits charge voltage information of the power storage device to the control unit of the power transmission apparatus (A'), the control unit of the power transmission apparatus (A') switches all of the switches (61, 62, 63) to conduction state based on the charge voltage information, and the power transmission apparatus (A') further includes: switches (61, 62, 63) that are respectively connected in parallel with the power transmission units (21, 22, 23) between input terminals; and a control unit configured to switch the switches (61, 62, 63) between an open state and a conduction state. switches (61, 62, 63) that are respectively connected in parallel with the power transmission units (21, 22, 23) between input terminals; and a control unit configured to switch the switches (61, 62, 63) between an open state and a conduction state.