A first curved portion constituting the one side of the curved portion constituting the endoscope insertion portion, the second curved portion with endoscope, die is continuously to the first curved portion, constitute the other side of the curved portion and a second operating device to be bending operation of the second bending portion and the first operating device is provided in the operating portion which is provided continuously with the second bending section, the proximal end of the insertion portion, curving operating the first bending portion, the bending at least, parts operating device, a selective power transmission mechanism that allows the bending operation of the first curved portion by the first operating device and the interlocking action of the first curved portion and second curved portion by the second operating device provided.第二湾曲部付き内視鏡は、内視鏡挿入部を構成する湾曲部の一方側を構成する第一湾曲部と、第一湾曲部に連設され、湾曲部の他方側を構成する第二湾曲部と、挿入部の基端に連設された操作部に設けられ、第1湾曲部を湾曲動作させる第1操作装置及び第2湾曲部を湾曲動作させる第2操作装置を備え、湾曲部操作装置は、少なくとも、第1操作装置による第1湾曲部の湾曲動作と、第2操作装置による第二湾曲部及び第一湾曲部の連動動作とを可能にする選択的動力伝達機構部を備える。
