Provided is an endoscopic treatment tool including: a sheath that has a longitudinal axis; a first operation wire and a second operation wire that are inserted through the sheath so as to be able to be moved forward and backward; a treatment part constituted by a first wire rod and a second wire rod that have lower bending rigidity than bending rigidity of the second operation wire; a first joint part inside which the second wire rod passes and that joins a distal-end section of the first operation wire and a proximal-end section of the first wire rod; and a second joint part that joins a distal-end section of the second operation wire and a proximal-end section of the second wire rod.