An ultrasonic treatment device performs a medical treatment by use of an ultrasonic vibration. The ultrasonic treatment device includes a probe, a tubular passage, and a tube path. The ultrasonic vibration is propagated to the probe. The probe includes a treating portion that performs the medical treatment to an object to be treated. The tubular passage is formed along a central axis of the probe and includes a sealing portion at distal position. The tube path is inserted into the tubular passage. The tube path includes a jetting port to jet out a fluid.
