Is irradiated while scanning the electromagnetic wave transmission and reception of electromagnetic waves to a living body to be measured area is to be properly performed, by detecting the temporal change of the phase difference signal to ensure that the state of a living body and the presence or absence of biological It is a biometric information detection system which can properly acquire information, etc., desired. In particular, the position of (11) is accompanied by scanning for measurement area wave receiving means, and irradiated with electromagnetic waves to give a strong directivity, and receives the reflected waves and, corresponding to each position of the measurement target region By acquiring the phase difference signal to detect the temporal change of the phase difference signal, can receive the reflected wave from the living body by irradiating an electromagnetic wave to reliably on human in which scanning is performed, indicating the movement of the living body by increasing the signal strength of the phase difference signal comprising a temporal variation, it is possible to reliably detect temporal changes, the present presence and location of a living body one or more of the measurement target region, it is possible to grasp accurately the existence range.電磁波を走査しつつ照射して、測定対象領域内の生体に対する電磁波の送受信が適切になされるようにし、確実に位相差信号の時間的変化を検出して、生体の存在の有無や生体の状態等、所望の情報を適切に取得できる生体情報検出システムである。詳細には、電磁波送受信手段(11)が測定対象領域に対し走査を伴いながら、強い指向性を与えて電磁波を照射し、且つ反射波を受信して、測定対象領域の各位置に対応する位相差信号を取得し、この位相差信号の時間的変化を検出することで、走査を行う中で生体に対し確実に電磁波を照射してその生体からの反射波を受信でき、生体の動きを示す時間的変化分を含む位相差信号の信号強度を高くして、時間的変化を確実に検出でき、測定対象領域における一又は複数の生体の存在及びその存在位置、存在範囲を精度よく把握できる。
