A wireless power transmission system comprising: a power transmission apparatus including an inverter circuit configured to convert first direct current power supplied from a power supply into alternating current power and configured to output the alternating current power, a power transmission antenna configured to wirelessly transmit the alternating current power output from the inverter circuit, and a power transmission control circuit configured to cause the inverter circuit to output the alternating current power and configured to output the alternating current power as binary communication data by varying frequency of the alternating current power output from the inverter circuit between a first frequency and a second frequency; and a power reception apparatus including a power reception antenna configured to receive the alternating current power wirelessly transmitted from the power transmission antenna, and a power reception amplitude modulator configured to vary amplitude of voltage of the alternating current power input to the power reception antenna between a first amplitude and a second amplitude, wherein, when transmitting first binary communication data to be output from the power transmission antenna to the power reception antenna through electromagnetic coupling between the power transmission antenna and the power reception antenna, the power transmission control circuit is configured to select the first frequency to represent the first binary state of the first binary communication data and the second frequency to represent the second binary state of the first binary communication data, wherein, when transmitting second binary communication data from the power reception antenna to the power transmission antenna through the electromagnetic coupling, the power reception amplitude modulator is configured to select the first amplitude to represent the first binary state of the second binary communication data and the second amplitude to represent the second binary state of the second binary communication data, and characterized in that the power transmission control circuit is configured to perform, using the inverter circuit, amplitude control for eliminating a difference between a third amplitude of the voltage of the alternating current power at a time when the frequency of the alternating current power is the first frequency and a fourth amplitude of the voltage of the alternating current power at a time when the frequency of the alternating current power is the second frequency. a power transmission apparatus including an inverter circuit configured to convert first direct current power supplied from a power supply into alternating current power and configured to output the alternating current power, a power transmission antenna configured to wirelessly transmit the alternating current power output from the inverter circuit, and a power transmission control circuit configured to cause the inverter circuit to output the alternating current power and configured to output the alternating current power as binary communication data by varying frequency of the alternating current power output from the inverter circuit between a first frequency and a second frequency; and a power reception apparatus including a power reception antenna configured to receive the alternating current power wirelessly transmitted from the power transmission antenna, and a power reception amplitude modulator configured to vary amplitude of voltage of the alternating current power input to the power reception antenna between a first amplitude and a second amplitude, wherein, when transmitting first binary communication data to be output from the power transmission antenna to the power reception antenna through electromagnetic coupling between the power transmission antenna and the power reception antenna, the power transmission control circuit is configured to select the first frequency to represent the first binary state of the first binary communication data and the second frequency to represent the second binary state of the first binary communication data, wherein, when transmitting second binary communication data from the power reception antenna to the power transmission antenna through the electromagnetic coupling, the power reception amplitude modulator is configured to select the first amplitude to represent the first binary state of the second binary communication data and the second amplitude to represent the second binary state of the second binary communication data, and characterized in that the power transmission control circuit is configured to perform, using the inverter circuit, amplitude control for eliminating a difference between a third amplitude of the voltage of the alternating current power at a time when the frequency of the alternating current power is the first frequency and a fourth amplitude of the voltage of the alternating current power at a time when the frequency of the alternating current power is the second frequency.