A communication device according to the present invention which receives a reception signal, includes: an intermodulation oscillator that outputs a signal of a first frequency; an adding section that adds together the reception signal and the signal of the first frequency; an intermodulation wave generating section that generates an intermodulation wave signal from the reception signal and the signal of the first frequency that are added together; a local oscillator that outputs a local signal; a mixer that generates an intermediate frequency signal by mixing the local signal into the intermodulation wave signal; a bandpass filter that extracts a signal of a desired frequency from the intermediate frequency signal; a voltage level detection section that detects a voltage level of a desired signal; and a control section that causes the intermodulation oscillator to output the signal of the first frequency when the voltage level of the desired signal is greater than a saturation level of the receiving section, and causes the intermediate frequency signal to be generated by mixing the local signal whose frequency is controlled into the intermodulation wave signal.