The measurement device includes an insertion portion which can be inserted into the external auditory canal, a pressing portion which urges the concha in a state where the insertion portion is inserted into the external auditory meatus, and a trunk of the tragus A sensor for contacting the tragus so as to sandwich the tragus, a sensor mounted on the contact portion and acquiring a biometric output at the tragus in a state where the contact portion is in contact with the tragus, and a sensor for acquiring the biometric output obtained by the sensor And a control unit for measuring the biological information based on the information.測定装置は、外耳道に挿入可能な挿入部と、挿入部を外耳道に挿入した状態で、耳甲介を付勢する押圧部と、耳甲介が押圧部により付勢された状態で、耳珠を挟み込むようにして耳珠に接触する接触部と、接触部に搭載され、接触部が耳珠に接触した状態で耳珠において生体測定出力を取得するセンサと、センサが取得した生体測定出力に基づいて生体情報を測定する制御部とを備える。
