Abstract: A charging device is wirelessly charges a terminal device having a power receiver that is disposed on a placement surface and receives wirelessly transmitted power. The charging device includes: a power transmission coil that transmits power to the terminal device; a processor coupled to a memory and configured to cause the power transmission coil to transmit power; a detection coil for detecting an arrangement position of the terminal device on the placement surface; a signal transmitter that outputs, to the detection coil, a first signal for generating a detection magnetic field; and a signal detector that detects an echo signal returned from the terminal device to the detection coil in response to the detection magnetic field. The processor is further configured to determine whether the terminal device is present within an estimated chargeable range by the power transmission coil, based on a detection result of the echo signal.