A cross polarization interference canceling apparatus of the present invention includes: error detector 26 for extracting a difference between a demodulated signal that is the main polarization signal in which compensation for cross polarization interference has been made and the received signal which indicates an ideal state of the main polarization, and outputting an error signal that indicates the extracted difference; phase noise detector 27 for outputting a phase noise difference by comparing a cross polarization interference compensating signal that is the opposite polarization signal in which compensation for cross polarization interference has been made with the error signal; a control signal generator for generating a control signal corresponding to the phase noise difference; and phase rotator 18′ disposed prior to, or posterior to, a cross polarization interference canceller for generating the cross polarization interference compensating signal, for controlling the phase of the cross polarization interference compensating signal in such a direction as to suppress the phase noise difference, in response to the input of the control signal.