PROBLEM TO BE SOLVED: To detect a pulse wave by irradiating infrared light and measuring a change in an infrared signal for the purpose of use at night or in a dark room. However, it is difficult to specify the skin region of the face in the infrared region where there is no color information. A biological information detection device, an image input unit for receiving a video signal including components of three wavelengths in an infrared region included in reflected light from an object, and a wavelength and intensity of reflected light from the video signal. A wavelength detection unit that acquires a face feature amount detection unit that detects a plurality of face feature points based on a video signal, and a measurement target region that specifies a measurement target region based on the detected face feature points. A specific unit, a wavelength fluctuation detection unit that detects the difference between the wavelength of the reflected light at each time from the measurement target region and the wavelength of the reflected light at a time before each time, and the change in the detected difference according to the time. And a pulse wave detection unit for detecting as a pulse wave. [Selection diagram] Figure 1【課題】夜間又は暗い部屋での使用を目的として、赤外光を照射し、赤外線信号の変化を計測することで脈波を検出する手法がある。ところが、色情報のない赤外域では顔の肌領域を特定することは困難である。【解決手段】生体情報検出装置であって、対象物からの反射光に含まれる赤外領域の三つの波長の成分を含む映像信号を受け付ける映像入力部と、映像信号から反射光の波長及び強度を取得する波長検出部と、映像信号に基づいて顔の複数の特徴点を検出する顔特徴量検出部と、検出された顔の複数の特徴点に基づいて計測対象領域を特定する計測対象領域特定部と、計測対象領域からの各時刻の反射光の波長と各時刻より前の時刻の反射光の波長との差分を検出する波長揺らぎ検出部と、検出された差分の時刻に応じた変化を脈波として検出する脈波検出部と、を有する。【選択図】図１
