A treatment tool for an endoscope which grasps an object of treatment, includes: a flexible sheath; a forward-and-backward moving section; and elastic grippers, wherein each of the pair of arms includes: a connector; a bent portion; a rectilinear portion; and a distal clasp, wherein in conjunction with the forward and backward movement operation of the forward-and-backward moving section, the distal ends of the pair of arms are deployed when the pair of arms are projected from the distal end of the sheath, the distal ends of the pair of arms are closed by elastic deformation when the pair of arms are moved into the sheath.