PROBLEM TO BE SOLVED: To provide a distal end of a side-view type endoscope, enabling to use a treatment tool in a stable state without causing stagger by reliably guiding the treatment tool into a treatment tool guiding groove on a treatment tool rising base, even if the treatment tool is formed only by a simple tube such as a contrast tube and has a bending tendency of the distal end.SOLUTION: The distal end is configured to satisfy AB≥BC in the coordinate axis of an axial direction of a distal end 2 of an insertion portion in a state in which the treatment tool rising base 7 is rotated to the most tilting side, where A is the top distal end position of the treatment tool guiding groove 9, B is the position where a straight line crossing a rotating axis line position comes into contact with the outer edge of the bank-like portion 10 and C is the rotating axis line position.COPYRIGHT: (C)2013,JPO&INPIT【課題】造影チューブ等のような単純なチューブのみで形成されて先端部分に曲がり癖がついた処置具であっても、処置具起上台の処置具誘導溝内に確実に誘導して、ふらつきなく安定した状態で使用することができる側方視型内視鏡の先端部を提供すること。【解決手段】処置具誘導溝9の最先端位置をA、回動軸線位置を通る直線が土手状部10の外縁と接する位置をB、回動軸線位置をCとして、処置具起上台7が最も倒立側に回動された状態のとき、挿入部の先端2の軸線方向の座標軸においてAB≧BCとなるように構成されている。【選択図】 図1
