While retaining the flexible portion of the endoscope, it is possible to fix the treatment tool, there is provided an endoscopic treatment tool insertion instrument can be adjusted to an endoscope visual field is caused to advance and retreat the treatment instrument. Endoscopic treatment instrument insertion instrument (1) is an endoscope (6) is mounted along the axial direction of the treatment instrument (4) by being attached to the guide tube (2) which is inserted through the treatment instrument (4) It is operable for axially. The guide operation portion that the proximal end is detachably connected to the tube (2) and (3), the operation portion (3) a window portion which is formed along the axial direction (7), the window portion (7 ) and a fixing member (8) and which is provided slidably along the.内視鏡の軟性部を保持しながら、処置具を固定でき、処置具を進退させて内視鏡視野を調整できる内視鏡用処置具挿通具を提供する。内視鏡用処置具挿通具(1)は、内視鏡(6)に軸方向に沿って装着され処置具(4)が挿通されるガイドチューブ(2)に装着されて処置具(4)を軸方向に操作可能とする。ガイドチューブ(2)の基端部に着脱自在に接続される手元操作部(3)と、手元操作部(3)の軸方向に沿って形成された窓部(7)と、窓部(7)に沿って摺動自在に設けられる固定部材(8)とを備える。
