Treatment instrument for endoscope

摘要

A treatment instrument for an endoscope includes: an operation portion (16); a cylindrical sheath (18) that is connected to the operation portion and that also comprises an insertion portion (14); an axial electrode (24) that is protruded from and retracted into a distal end opening portion of the sheath by an operation of the operation portion; and a distal end electrode portion (12) that is provided at a distal end portion of the axial electrode; wherein a tapered portion is formed at a distal end portion of the sheath, the tapered portion being in a tapered shape that a distal end side of the distal end portion is narrower than a proximal end side of the distal end portion.