A high-frequency treatment tool of the present invention includes a flexible tube that is inserted into a body cavity an operating wire that is inserted through the flexible tube so as to be movable back and forth a treatment part that is arranged on a distal end of the operating wire and treats biological tissue by applying a high-frequency current a main body that fixes a base end of the flexible tube a slider-fixing part that fixes a base end of the operating wire guided from the base end of the flexible tube and slides the operating wire in an axis direction with respect to the main body and a slider-gripping part that is provided so as to encircle at least a portion of an outer peripheral surface of the slider-fixing part and slides the slider-fixing part by the operation of a user. The slider-fixing part is unrotatably coupled to the main body and the slider-gripping part is rotatably coupled to the slider-fixing part.
