To provide the effect of suppressing image signal components in the process of spectrum inverse spreading at all times.

High frequency signals inputted from a reception input terminal 16 are frequency converted by a frequency conversion circuit 112, then inversely spectrum spread by a spectrum inverse spreading circuit 123 and demodulated by a demodulation circuit 132 further. At that time, when image interference is detected from the output signals of the spectrum inverse spreading circuit 123, an image interference detection circuit 18 controls a spreading code change circuit 122, changes a spreading code used in the spectrum inverse spreading circuit 123 and a spectrum spreading circuit 121 and changes the spreading code of the signals of a target frequency to be received. Thus, the signals causing the image interference are suppressed by the spectrum inverse spreading of the spectrum inverse spreading circuit 123 and the image interference by the signals provided with the same spreading code as reception signals is suppressed as well.