A holding frame 46 made of a material having a larger shearing stress than the hard part 31 (distal end part 5) of the distal end part is adhered and fixed to the distal end rigid part 31 in a state that one end surface is exposed from the inclined surface 37 a, and this holding frame 46 And holds the image guide 16 and the light guide 22. In addition, by providing the groove 49 on the side surface of the holding frame 46 and exposing one end of the groove 49 to the distal end surface 37 (the inclined surface 37 a) of the distal end rigid portion 31, it is possible to reduce the size of the distal end portion without impairing the durability And improves repairability.先端部硬質部31(先端部5)よりも剪断応力が大きな材料からなる保持枠46を、一端面が傾斜面37aから露出した状態で先端硬質部31に接着固定し、この保持枠46を介してイメージガイド16及びライトガイド22を保持する。加えて、保持枠46の側面に溝49を設け、当該溝49の一端を先端硬質部31の先端面37(傾斜面37a)に露出させることにより、耐久性を損なうことなく先端部の小型化を実現するとともに、修理性を向上する。
