The present invention achieves a reduction in the number of parts and unitization of the mechanism, which contributes to simplification of the assembly process and reduction of manufacturing cost, and contributes to improvement of workability such as readjustment at the time of overhaul and repair, etc. For this purpose, the bending angle adjusting mechanism 30 of the endoscope 1 is provided so as to extend in the longitudinal direction of the insertion portion 8 and has a rod member 54 formed with a thread portion on the longitudinal surface. A plate member 52 that is provided in parallel with the longitudinal direction of the bar member and is bent in a substantially right angle direction, and that allows the bar member to be inserted therethrough； an adjustment piece 55 that is screwed into a threaded portion of the bar member； A guide member 53 provided in parallel with the member through which the long member 32 passes, a guide surface 53xa for guiding the adjustment piece in the longitudinal direction of the insertion portion, and a bar member with respect to the guide member Rotate around the longitudinal direction And a rotation stopping member 51 to suppress Rukoto, the guide member at least one surface is not parallel to the guide surface is fixedly arranged between the adjusting piece and the plate member.本発明は、部品点数の削減と機構のユニット化を実現し組み立て工程の簡素化と製造コストの低減化に寄与し分解修理時等の再調整等の作業性の向上に寄与する湾曲角度調整機構を提供することを目的とし、そのための内視鏡１の湾曲角度調整機構３０であって挿入部８の長手方向に延出するように設けられ長手方向表面にねじ部が形成される棒部材５４と、棒部材の長手方向に平行して設けられ略直角方向に曲げられた両端において棒部材を挿通させる板部材５２と、棒部材のねじ部に螺合する調整片５５と、棒部材と板部材とに平行に配置され長尺部材３２を通過させる誘導路５３ｘｂと、調整片を案内する案内面５３ｘａとを挿入部の長手方向にそれぞれ設けたガイド部材５３と、棒部材がガイド部材に対して長手方向を軸として回転することを抑える回転止め部材５１とを備え、ガイド部材は案内面と平行でない少なくとも１つの面が調整片と板部材とに挟まれて固定されている。
