The endoscope comprises: a first shaft, one end of which is affixed to the grip and the other end of which extends outside of the grip a second shaft disposed on the same axis as the first shaft and is rotatable around the axis of the first shaft an operation knob installed so as to rotate the second shaft around the axis thereof a cover member installed on the operation knob on the side near the grip a supporting part that holds the cover member on the operation knob a pressing member that presses the operation knob towards the grip a first ring-shaped sealing member that is pressed toward the operation knob by the pressing member and a sloped surface, which is formed on at least one of the pressing member and the operation knob, is slanted with respect to the axial direction of the first shaft and to the direction that is orthogonal to the axial direction of the first shaft, supports the first sealing member that is pressed toward the operation knob by the pressing member to circumscribe the first shaft, and supports the first sealing member in the direction along the axial direction of the first shaft.La présente invention concerne un endoscope constitué des éléments suivants : une première tige, dont une extrémité est affixée à la poignée et lautre extrémité sétend en dehors de la poignée une seconde tige placée sur le même axe que la première tige, capable de pivoter autour de laxe de la première tige une mollette dactionnement installée de manière à faire pivoter la seconde tige autour de son axe un élément de couverture installé sur la mollette dactionnement sur le côté proche de la poignée une partie de support qui maintient lélément de couverture sur la mollette dactionnement un élément de pression qui appuie sur la mollette dactionnement en direction de la poignée un premier élément détanchéité de forme annulaire qui est comprimé en direction de la mollette dactionnement par lélément de pression et une surface inclinée. Ladite surface inclinée est f
