Ultrasonic sensor

摘要

An ultrasonic sensor (21) includes a case consisting of a case body (21) and a base (23), a piezoelectric diaphragm (25) which is arranged in the case, a conical vibrator (32) which is bonded to an ultrasonic transmitting/receiving side of the piezoelectric diaphragm (25), and a tubular member (24) which is arranged in front of the vibrator (32) for guiding ultrasonics.