Abstract: A measurement apparatus includes an insertion portion insertable in an external ear canal, a pressing portion that presses a concha when the insertion portion is inserted in the external ear canal, a contact portion that comes into contact with a tragus to clamp the tragus when the concha is pressed by the pressing portion, a sensor that is mounted on the contact portion and acquires biological measurement output at the tragus when the contact portion is in contact with the tragus, and a controller that measures biological information on the basis of the biological measurement output acquired by the sensor.