An endoscope 1 includes: an operation lever portion 30 provided in an operation portion 3, the operation lever portion 30 including an operation shaft 32 and being capable of adjusting a bending angle of a bending portion 7 in linkage with a tilting action a sliding body 37 disposed so as to be freely movable back and forth in an axial direction of the operation shaft 32 a flexible exterior cover 33 watertightly fixed to the operation portion 3 so as to cover an outer periphery of the sliding body 37 and the operation shaft 32, the flexible exterior cover 33 being deformable by fluctuation of an internal pressure of the operation portion 3 and a return member 38 configured to return the sliding body 37 to a side of the operation portion 3 when the internal pressure of the operation portion 3 is depressurized.
