An endoscope system having: an insertion section inserted into a lumen along a longitudinal axis a tip-constituting section provided on the tip of the insertion section a swinging base that swings a treatment tool, at the tip of the insertion section a long traction member connected to the swinging base inside the tip-constituting section and remotely operating the swinging base a tubular elastic member covering the traction member, having the tip thereof connected, in a water-tight manner, to the tip side of the traction member or to the swinging base, and having the rear end thereof connected to the tip-constituting section, in a water-tight manner a cylindrical cover attached to the tip-constituting section and having an opening in the surface thereof a cover removal tool capable of pressing the rim of the opening in a state in which the cover removal tool is engaged with the cover and a protrusion provided in the cover removal tool and coming in contact with the rim of the opening in a state in which the cover removal tool is caused to be engaged with the cover, at a position separated in the longitudinal axis direction from a position at one end of the elastic member.La présente invention concerne un système dendoscope comprenant : une section dinsertion insérée dans une lumière le long dun axe longitudinal une section formant pointe disposée sur la pointe de la section dinsertion une base doscillation qui fait osciller un outil de traitement à la pointe de la section dinsertion un élément de traction long relié à la base doscillation dans la section formant pointe et actionnant à distance la base doscillation un élément élastique tubulaire recouvrant lélément de traction, dont lextrémité est reliée, de manière étanche à leau, au côté pointe de lélément de traction ou à la base doscillation et dont lextrémité arrière est reliée à la section formant pointe, de manière étanche à leau un couvercle cylindrique fixé à la section formant pointe et ayant une ouve
