This measurement device is provided with: an insertion part capable of being inserted into an ear canal； a pressing part which presses towards the concha when the insertion part is inserted into the ear canal； a contact part which is brought into contact with the tragus so as to sandwich the tragus in the state where the pressing part is pressed towards the concha； a sensor which is installed in the contact part and acquires a biological measured output at the tragus in the state where the contact part is in contact with the tragus； and a control unit for measuring biological information on the basis of the biological measured output acquired by the sensor.測定裝置包括：插入部，可插入至外耳道；按壓部，在將插入部插入至外耳道的狀態下，對耳甲進行施壓；接觸部，在耳甲受到按壓部施壓的狀態下，以夾住耳珠的方式與耳珠接觸；感測器，搭載於接觸部，在接觸部與耳珠接觸的狀態下在耳珠上獲取生物體測定輸出；以及控制部，基於感測器所獲取的生物體測定輸出測定生物體資訊。
