[PROBLEMS] To make it possible to facilitate the assembling work, and to provide an endoscope insertion portion with high component reuse ratio after disassembly. A is a bending piece 20B and the connecting pipe 57A are bonded with a bonding bushing 61 and inserting pin 62. Bending piece 20B is connected through hole is formed. Connection pipe 57A is connected through hole is formed. The outer peripheral surface is fitted in the bending pieces 20B on the inner peripheral surface of the connecting pipe 57A, the bush 61 penetrates for joining the connecting through-hole communicating. Engagement when inserting the insertion pin 62 a connecting through-hole joining the bushing 61 in a state of penetrating and engaging pawls of the joint bushing 61 is enlarged in the radial direction of the inner peripheral surface side periphery of the first coupling through-hole to stop. .BACKGROUND【課題】組立作業を容易にすることを可能とし、且つ分解作業後の部品再利用率の高い内視鏡挿入部を提供する。【解決手段】湾曲駒20Bと接続管57Aとは接合用ブッシュ61及び挿入ピン62を用いて接合される。湾曲駒20Bは、連結用貫通孔が形成されている。接続管57Aは、連結用貫通孔が形成されている。接続管57Aの内周面に湾曲駒20Bの外周面が嵌合し、連通する連結用貫通孔を接合用ブッシュ61が貫通する。連結用貫通孔を貫通した状態の接合用ブッシュ61に挿入ピン62を挿入すると、径方向に拡大して接合用ブッシュ61の係止爪が第1連結用貫通孔の内周面側周縁を係止する。【選択図】図6
