Provided is an endoscope treatment instrument that includes a catheter tube (5) at a distal end of which a balloon section (2) is provided. At a distal end of a balloon membrane (3) constituting the balloon section (2), a distal end surface, which is continued to an outer surface (3a) of the balloon membrane (3), is bonded to a distal-end first outer peripheral surface (5a) of the catheter tube (5). At a proximal end of the balloon membrane (3), a proximal end surface, which is continued to an inner surface (3b) of the balloon membrane (3), is bonded to a distal-end second peripheral surface (5b) of the catheter tube (5), the distal-end second peripheral surface (5b) being located closer to the proximal end side than the distal-end first outer peripheral surface (5a) of the catheter tube (5). Due to this configuration, the balloon section can be withdrawn without being damaged when the endoscope treatment instrument is withdrawn through an endoscope.
