PURPOSE: To attain reception at high sensitivity while suppressing the increase of a cost by using a high frequency amplifier for a substantial high frequency amplifier amplifying a reception signal in common use as an intermediate frequency amplifier amplifying an intermediate frequency signal.

CONSTITUTION: A high frequency amplifier 11 having a gain to both a reception band and an intermediate frequency band is prepared and a reception signal is given to the high frequency amplifier 11 and a high pass filter 12 is provided on the output side of the high frequency amplifier 11 and the amplified reception signal is extracted by the high pass filter 12. The extracted reception signal is inputted to a frequency converter 3, in which the signal is converted into an intermediate frequency signal having lower frequency than the reception frequency. The intermediate frequency signal is inputted again to the high frequency amplifier 11, where the intermediate frequency signal is amplified. A low pass filter 14 is connected to the output of the high frequency amplifier 11 and the low pass filter 14 extracts the intermediate frequency signal. Thus, the increase of the cost and the increase of power consumption are suppressed to attain high sensitivity.