Ultrasonic treatment apparatus (21) includes an ultrasonic transducer for generating ultrasonic vibrations (28), the vibration transmitting portion which transmits the ultrasonic vibration generated by the ultrasonic oscillator (28) and (29), the vibration transmission formed at the end of the part (29), the ultrasonic vibrations from the vibration transmitting portion (29) the treatment unit for transmitting to the body tissue (32), provided to be openable and closable with respect to the treatment portion (32) a gripping member (33), the treatment portion of the gripping member (33) (32) and provided at a location facing the gripping member (33) is the treatment portion in the closed state (32) and abutting a pad member (49) and, it is equipped with. The tip portion of the pad member (49) has a protrusion (60) projecting in the direction of the treatment portion on the side opposite to the treatment portion (32) (32).