Abstract: To stably obtain biometric information, such as a respiratory rate and a heart rate, from a time waveform indicating a change in phase of a Doppler signal, provided is a biometric information detection system including: an arctangent demodulation module which acquires a time waveform indicating a change in phase of a Doppler signal acquired by receiving a wave reflected from a person to be measured; a unit waveform acquisition module which acquires a plurality of unit waveforms from the time waveform; a reference waveform generation module which generates a reference waveform based on the plurality of unit waveforms; a waveform correction module which corrects the time waveform based on the reference waveform; and a biometric information acquisition module which acquires biometric information based on the corrected time waveform.