A wireless communication device configured to prevent a transmission time period for sending a wireless signal and a receiving time period for receiving a wireless signal from being overlap, comprises: a transmitter that includes an orthogonal modulator that orthogonally modulates an IQ-modulated modulation signal and a transmission power amplifier that power-amplifies the orthogonally modulated signal; a receiver that includes a demodulator that demodulates a received signal; a first power source that is the power source for the transmission power amplifier and the receiver; and a second power source that is the power source for the orthogonal modulator; and a controller which outputs the modulation signal to the orthogonal modulator. The first power source outputs a constant voltage to the receiver during the receiving time period, and outputs, during the transmission time period, to the transmission power amplifier, a fluctuating voltage according to an envelope of the modulation signal.