A sensor holder comprises a sensor mounting part having a first face on which a blood sensor is placed, a second face provided on the opposite side from the first face, and a through-hole that goes from the first face to the second face and is large enough to allow a laser beam to pass through a finger holding part that is provided on the second face and surrounds the through-hole, and a grip that sticks out from the blood testing device when the sensor holder is mounted to the blood testing device.
