An endoscope includes a bending section provided in an insertion section inserted into a subject, the bending section being bendable； a coupling tube disposed on an inside of the bending section and configured in a tubular shape by concatenating a first annular section and a second annular section to be capable of coming into contact with each other, the coupling tube being capable of changing rigidity of a part of the bending section； and a coupling tube operation section that disposes an inclined surface of the first annular section and an inclined surface of the second annular section adjacent to each other to be superimposed in an insertion axial direction of the insertion section.
