PROBLEM TO BE SOLVED: To provide a biological information measurement device which can measure displacement of external auditory canal even when a difference occurs in a measurement reference distance between the external auditory canal and a sensor part.SOLUTION: A biological information measurement device 1A comprises: a sensor part 10 that detects reflection light from external auditory canal to output a detection signal SD1 a differential circuit 20 that outputs a differential signal SD2 showing a change amount per unit time of the detection signal SD1 received from the sensor part 10 and a control unit 40 that calculates the displacement of the external auditory canal on the basis of the differential signal SD2 received from the differential circuit 20.COPYRIGHT: (C)2015,JPO&INPIT【課題】外耳道とセンサ部との間の測定基準距離に差異が生じた場合においても外耳道の変位を測定可能な生体情報測定装置を提供する。【解決手段】生体情報測定装置1Aは、外耳道からの反射光を検知して検知信号SD1を出力するセンサ部10と、センサ部10から受けた検知信号SD1の単位時間あたりの変化量を示す微分信号SD2を出力する微分回路20と、微分回路20から受けた微分信号SD2に基づいて、外耳道の変位を算出する制御部40とを備える。【選択図】図1
