A reception device comprising: an orthogonal detector configured for subjecting a received signal to orthogonal detection so as to output an I-phase baseband signal and a Q-phase baseband signal orthogonal to each other; high-pass filters (22, 24) configured for reducing a direct current component of the respective baseband signals output from the orthogonal detector; a demodulator configured for demodulating the baseband signals output from the high-pass filters (22, 24); a distribution detector configured for deriving an average power value of the baseband signal for each quadrant on an IQ plane, comparing the average power values of the respective quadrants, and outputting a detection signal when a result of the comparing exceeds a predetermined threshold; measurement filters (18, 20) configured for measuring the direct current component of the respective baseband signals output from the orthogonal detector; delay circuits (32, 34) configured for delaying the respective baseband signals output from the orthogonal detector over a period of time commensurate with a processing delay in the respective measurement filters (18, 20) so as to output the respective baseband signals thus delayed to the respective high-pass filters (22, 24); and detection high-pass filters (36, 38) configured for reducing the direct current component of respective baseband signals output from the orthogonal detector and output the respective baseband signals with the reduced direct current component to the distribution detector, wherein when the distribution detector outputs the detection signal, the distribution detector is configured for rewriting a respective value of a signal in the high-pass filters (22, 24) and the detection high-pass filters (36, 38) into a value of the direct current component measured by the measurement filters (18, 20). an orthogonal detector configured for subjecting a received signal to orthogonal detection so as to output an I-phase baseband signal and a Q-phase baseband signal orthogonal to each other; high-pass filters (22, 24) configured for reducing a direct current component of the respective baseband signals output from the orthogonal detector; a demodulator configured for demodulating the baseband signals output from the high-pass filters (22, 24); a distribution detector configured for deriving an average power value of the baseband signal for each quadrant on an IQ plane, comparing the average power values of the respective quadrants, and outputting a detection signal when a result of the comparing exceeds a predetermined threshold; measurement filters (18, 20) configured for measuring the direct current component of the respective baseband signals output from the orthogonal detector; delay circuits (32, 34) configured for delaying the respective baseband signals output from the orthogonal detector over a period of time commensurate with a processing delay in the respective measurement filters (18, 20) so as to output the respective baseband signals thus delayed to the respective high-pass filters (22, 24); and detection high-pass filters (36, 38) configured for reducing the direct current component of respective baseband signals output from the orthogonal detector and output the respective baseband signals with the reduced direct current component to the distribution detector, wherein when the distribution detector outputs the detection signal, the distribution detector is configured for rewriting a respective value of a signal in the high-pass filters (22, 24) and the detection high-pass filters (36, 38) into a value of the direct current component measured by the measurement filters (18, 20).