POWER TRANSMISSION DEVICE, POWER TRANSMISSION AND RECEIVING DEVICE, METHOD FOR DETECTING POWER RECEIVING DEVICE, POWER RECEIVING DEVICE DETECTION PROGRAM, AND SEMICONDUCTOR DEVICE

To provide a power transmission device that can accurately discriminate a device or apparatus placed on a secondary side from a foreign object placed on the secondary side without adding a complex circuit. The power transmission device includes a control unit that sets a drive frequency of a signal for driving a resonance circuit, an inverter unit that drives the resonance circuit at three or more drive frequencies on the basis of a setting of the control unit, and a waveform monitor unit that detects a drive waveform of the resonance circuit. The control unit sets three or more drive frequencies according to a procedure of a program stored in a storage unit, compares signal data at the drive frequencies detected by a drive waveform detecting unit with each other, and detects a power receiving device on the basis of the comparison result.