The compression resistance of a sheath is enhanced, and the insertability into the bile duct or the like is enhanced by reducing the diameter while maintaining a moderate flexural rigidity. Provided is an endoscope treatment tool provided with: a tubular sheath member (2) that can be inserted into a channel of an endoscope； a wire (4) that is inserted into the interior of the sheath member (2) in such a manner that the wire (4) can be advanced/retracted in the longitudinal direction of the sheath member (2)； and a distal-end treating portion that is provided at the distal end of the wire (4) and that is made to protrude from/be pulled into a distal-end opening in the sheath member (2) by advancing/retracting the wire (4), wherein the sheath member (2) is configured having a two-layer structure in which a metal coil (6) and a resin tube (7) are layered in the radial direction and secured to each other at least at both ends in the longitudinal direction thereof, in the metal coil (6), lateral cross-sectional shapes of portions of a strand that are adjacent to each other in the longitudinal direction have complementary depression and protrusion that are brought into tight contact with each other, and the resin tube (7) has a flexural rigidity that is greater than that of the metal coil (6).
