The insertion device water-tightly covers the entire pulling wire connected to the oscillating table with a tubular elastic member in the distal end constituting portion, retreats a predetermined distance toward the proximal side from the opening of the treatment tool channel hole in the longitudinal direction So that the fixing position of the elastic member is provided. The pulling wire is not exposed to the exterior, so that contaminants or the like do not adhere during treatment, and wrinkles of the elastic member shrunk to the elevation of the swing table are accommodated in a space generated by a predetermined distance.挿入機器は、先端構成部内において、揺動台に連結する牽引ワイヤ全体を管状の弾性部材により水密に覆い、長手軸方向で処置具チャンネル孔の開口部よりも基端側に所定距離を後退して弾性部材の固定位置を設けている。牽引ワイヤは、外部に露出せず、処置中に汚液等が付着せず、揺動台の起上に縮んだ弾性部材のしわを所定距離により生じたスペースに収容する。
