An endoscope apparatus (1) includes a transparent member (32) provided at a distal end of an insertion portion (11) of an endoscope (2) to face an image pickup optical system, an ultrasonic transducer (37) attached to an inner surface of the transparent member (32), and a deflection portion (32a) provided at an outer surface of the transparent member (32) which changes a direction of propagation of an ultrasonic wave from the ultrasonic transducer. With the configuration, an ultrasonic wave for stain removal is efficiently propagated from the ultrasonic transducer (37) into a region of an observation field of view in an observation window.
