An endoscope 1 includes an operation section 3, an insertion section 2 extending from the operation section 3 and including a distal end portion 5 and a bending portion 6, a first closed space S1 provided in the distal end portion 5 and sealed against a space in the bending portion 6, a second closed space S2, provided in the distal end portion 5 and sealed against the space in the bending portion 6, where an observation optical system 9 and an illumination optical system 8 are disposed, a communication passage 60 provided in the distal end portion 5 and configured to communicate between the first closed space S 1 and the second closed space S2, and an elongated tube member 10 having a through hole in a longitudinal direction, and having one end portion coupled with the first closed space S 1 and another end portion provided inside the operation section 3.
