There is provided a pulse wave detector and biometric information measurement device which can flexibly change the state of pressing against a body surface by a sensor unit used by being pressed against the body surface and improve the accuracy of pulse wave detection. A biometric information measurement device includes: a sensor unit 6 having element arrays 60, 70 which include a plurality of pressure detection elements arranged in a direction B and which are arranged in a direction A； an air bag 2 for pressing the sensor unit 6 against a body surface of a body in a state where the direction B intersects with an extension direction of artery under the body surface； a rotation mechanism 5 for rotating the sensor unit 6 about a first axis X extending in the direction B； and a rotational drive unit 10 for driving the rotation mechanism 5. The rotation mechanism 5, the air bag 2, and the sensor unit 6 are arranged in this order in the direction of pressing by the air bag 2.
