A treatment tool for an endoscope, including: an insertion tube extending toward one direction; a movable tip member which is provided on a tip of the insertion tube and which is used for a treatment of a living organ; a control member of which a tip is connected to the insertion tube and controls the movable tip member by advancing and retracting a control shaft member inserted in the insertion tube; and a covering tube which covers at least one part of a circumference of the insertion tube. At least one part of the insertion tube rotates freely about an axis of the insertion tube.