Provided is a bending portion of an endoscope capable of realizing an optimal curved shape according to the application with a simple configuration. Therefore, the bending part for the vertical bending arranged in the first bending region A1 set on the distal end side of the bending part 6 and the bending part for the right and left bending are arranged such that the pair of protruding parts 32 b are disposed on the central axis Oi of the insertion part 2 A bending part for right and left bending which is constituted by the second nodal ring 32 arranged on the axis target and arranged in the second bending region A 2 set on the proximal end side of the bending part 5 is referred to as a second nodal And a bending part for vertically bending excavated in the second bending region is formed by a pair of protruding parts 33b with respect to the center axis Oi of the insertion part 2 upward from the axis target position by a predetermined offset amount And a third nodal ring 33 that is offset from the first nodal ring 33.簡単な構成により、用途に応じた最適な湾曲形態を実現することができる内視鏡の湾曲部を提供する。このため、湾曲部6の先端側に設定した第1の湾曲領域A1に配列する上下湾曲用の節輪及び左右湾曲用の節輪を、一対の突起部32bが挿入部2の中心軸Oiに対して軸対象に配置された第2の節輪32によって構成し、且つ、湾曲部5の基端側に設定した第2の湾曲領域A2に配列する左右湾曲用の節輪を第2の節輪32によって構成するとともに、第2の湾曲領域に排泄する上下湾曲用の節輪を、一対の突起部33bが挿入部2の中心軸Oiに対して軸対象位置から上方に所定のオフセット量にてオフセットされた第3の節輪33によって構成する。
