An ultrasonic treatment device includes a probe in which a hole-shaped portion, being opened at a first opening position placed at a distal end portion of the probe and a second opening position placed at an outer peripheral portion of the probe and allowing the first opening position and the second opening position to communicate with each other, is formed. The ultrasonic treatment device includes a path which is extended in the hole-like portion from the first opening position to the second opening position along the longitudinal axis, and which is extended to an outside of the probe from the second opening position, and the path being extended to the extending position of the fixed handle toward the handle extending direction in the fixed handle.