PROBLEM TO BE SOLVED: To provide a treatment instrument insertion tool having a configuration with high slidability of a treatment instrument while ensuring fluid-tightness.SOLUTION: A treatment instrument insertion tool 20 which is attached to an insertion device to be inserted into a subject and inserts a treatment instrument for treating the subject into the subject comprises: a cylindrical tube 21 for guiding a treatment instrument 31 into a subject a guide part body 22 which, when an insertion part of the insertion device is inserted into the subject, can be attached to and detached from a portion located outside the subject in an insertion part and is provided on one end 21a side of a tube 21 to become an insertion port of the treatment instrument 31 to the tube 21 a slider 41 attached to the treatment instrument 31 and fitted to the guide part body 22 in a relatively movable manner and a lubricant 50 filling the tube 21.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】液密を確保しつつ、処置具の摺動性が高い構成を具備する処置具挿通具を提供する。【解決手段】被検体内に挿入される挿入機器に取り付けられ、被検体を処置する処置具を被検体内に挿入させる処置具挿通具20であって、処置具31を被検体内に案内する筒状のチューブ21と、挿入機器の挿入部が被検体内に挿入された際、挿入部の被検体外に位置する部位に着脱自在であるとともに、チューブ21の一端21a側に設けられチューブ21への処置具31の挿通口となる案内部本体22と、処置具31に取り付けられるとともに、案内部本体22に対して相対的に移動可能に装着されるスライダ41と、チューブ21内に充填された潤滑剤50と、を具備する。【選択図】図2