In addition to improving compression resistance of the sheath, it maintains moderate flexural rigidity and improves insertability into bile ducts by reducing the diameter. A tubular sheath member (2) which can be inserted into a channel of the endoscope, a wire (4) inserted into the sheath member (2) so as to be able to advance and retreat in the longitudinal direction of the sheath member (2) And a distal end treatment portion which is provided at the distal end of the wire (4) and protrudes from the distal end opening of the sheath member (2) by advancing and retreating of the wire (4), wherein the sheath member (2) ) And the resin tube (7) are overlapped in the radial direction and are fixed to each other at least at both ends in the longitudinal direction, and the metal coil (6) has a two-layer structure in which longitudinally adjacent strands mutually Sectional shape having complementary concave portions and convex portions to be brought into close contact with each other, and the resin tube (7) has higher flexural rigidity than the metal coil (6).シースの耐圧縮性を向上するとともに、適度の曲げ剛性を維持し、かつ、細径化を図って胆管等への挿入性を向上させる。内視鏡のチャンネル内に挿入可能な管状のシース部材(2)と、該シース部材(2)の内部に、該シース部材(2)の長手方向に進退可能に挿入されたワイヤ(4)と、該ワイヤ(4)の先端に設けられ、ワイヤ(4)の進退によりシース部材(2)の先端開口から突没させられる先端処置部とを備え、シース部材(2)が、金属コイル(6)と樹脂チューブ(7)とを径方向に重ね、少なくとも長手方向の両端において相互に固定された2層構造に構成され、金属コイル(6)は、長手方向に隣接する素線が、相互に密着させられる相補的な凹部と凸部とを有する横断面形状を備え、樹脂チューブ(7)が、金属コイル(6)よりも高い曲げ剛性を有する内視鏡用処置具を提供する。
