This first lens cleaner for an endoscope is provided with: an elastically deformable long member and a cleaning member affixed to the outer peripheral surface of the distal end section of the long member. The long member has a bent section on the distal end side thereof. The cleaning member is configured so that, when the long member is inserted through a treatment instrument insertion channel in the endoscope and protrudes from the distal end of the endoscope, an envelope line of the cleaning member, the envelope line being located on the lens surface side of the endoscope, has a portion not parallel to a plane perpendicular to the axial direction of the endoscope. Further, this second lens cleaner for an endoscope is provided with: an elastically deformable long member a cleaning member affixed to the outer peripheral surface of the distal end section of the long member and an outer cylinder capable of containing the long member and the cleaning member. The long member has a bent section located closer to the proximal end side than the cleaning member, and the cleaning member faces the lens surface of the endoscope.La présente invention concerne un premier dispositif de nettoyage de lentille pour un endoscope, ledit dispositif de nettoyage comprenant : un élément allongé pouvant se déformer élastiquement et un élément de nettoyage fixé à la surface périphérique externe de la section dextrémité distale de lélément allongé. Lélément allongé comporte une section courbée côté extrémité distale de ce dernier. Lélément de nettoyage est configuré de telle sorte que, lorsque lélément allongé est inséré à travers un canal dinsertion dinstrument de traitement dans lendoscope et fait saillie depuis lextrémité distale de lendoscope, une ligne denveloppe de lélément de nettoyage, la ligne denveloppe étant située côté surface de lentille de lendoscope, comporte une partie qui nest pas parallèle à un plan perpendiculaire à la direction axiale de lendoscope. En outre, ce second
