INSPECTING DEVICE, INSPECTING UNIT, AND INSPECTING METHOD

Provided is an inspecting device (10) for inspecting a composite material member (1) which is formed from a composite material and includes a main surface (1a) and an intersecting surface. The inspecting device (10) is provided with: a main body part (14); an ultrasonic probe (15) which is coupled to the main body part (14) and is brought into contact with the main surface (1a); an optical sensor part (16) which is coupled to the main body part (14) in such a way as to be capable of moving in a first direction (Z); and a processing device. The ultrasonic probe (15) is configured to cause ultrasonic waves to be incident on the main surface (1a) of the composite material member (1), and to receive reflected waves. The optical sensor part (16) is configured to emit sensor light in a second direction (X) perpendicular to the first direction (Z), and to receive reflected light. The processing device is configured to output a measurement result obtained on the basis of the reflected waves and the reflected light. In this way, defects in the composite material member are detected in cases in which it is assumed that a plurality of defects are aligned in the direction in which the ultrasonic waves are incident.