PROBLEM TO BE SOLVED: To provide an endoscope with excellent operability without increasing loads put on fingers operating a bending operation device as a bend part approaches the maximum bending state.SOLUTION: An endoscope 10 includes: an insertion part 11 having a distal end part 14 provided with a distal end configuration member 24 and a bend part 15 a channel tube 49 inserted and disposed inside the insertion part 11 a channel distal end member 40 to which the channel tube 49 is fixed an operation part 12 having a bending operation device 17 for bending the bend part 15 a projection part 42 provided away from a distal end face of the channel distal end member 40 a through-hole 32 for a treatment tool insertion channel having a large diameter hole 33 and a small diameter hole 34 provided on the distal end configuration member 24 an O ring 48 for keeping watertightness and a regulation member 50 fixed to the large diameter hole 33 and having an inner space 51 where the projection part 42 is freely slidably disposed and a holding hole 52 which communicates the inner space 51 and the outside and where a proximal end tube part 43 is freely slidably disposed.COPYRIGHT: (C)2014,JPO&INPIT【課題】湾曲部が最大湾曲状態に近づくにつれて湾曲操作装置を操作する手指にかかる負荷が増大することのない操作性に優れた内視鏡を提供する。【解決手段】内視鏡10は、先端構成部材24を備える先端部14及び湾曲部15を備える挿入部11と、挿入部11内に挿通配置されるチャンネルチューブ49と、チャンネルチューブ49が固定されるチャンネル先端部材40と、湾曲部15を湾曲させる湾曲操作装置17を備える操作部12とを具備し、チャンネル先端部材40の先端面から離間して設けられた凸部42と、先端構成部材24に設けられた大径孔33及び小径孔34を有しする処置具挿通チャンネル用貫通孔32と、水密を保持するOリング48と、大径孔33に固定される、凸部42が摺動自在に配置される内部空間51及び内部空間51と外部とを連通し基端管部43が摺動自在に配置される保持孔52を備える規制部材50と、を具備する。【選択図】図3
