An ultrasonic treatment device for surgery includes: a treatment portion (ultrasonic probe) for treating living-body tissue by transmitting thereto ultrasonic vibrations generated by means of an ultrasonic transducer; a fixed manipulating section main body wherein this treatment portion is inserted and arranged; a moveable jaw that grips living-body tissue with this treatment portion, being arranged opposite to this treatment portion and being freely rotatably supported at the peripheral surface of this manipulating section main body; and a moveable handle linked with the moveable jaw for opening/closure operation of this moveable jaw with respect to the treatment portion and freely rotatably supported on the peripheral surface of the manipulating section main body; wherein the moveable jaw and the moveable handle are arranged on the same side with respect to the longitudinal central axis of the fixed manipulating section main body.