There is provided an endoscope (10) that provides good bending operability when a balloon (60) attached to an insert portion (12) is inflated and good flexibility of a soft portion (40). An insert portion (12) of an endoscope (10) includes a bending portion (42) and a soft portion (40) on the proximal side from the bending portion (42). An inflatable/deflatable balloon (60) is attached to the insert portion (12) on the proximal side from the bending portion (42). A supplying/sucking opening (46) for supplying and sucking fluid to and from the balloon (60) is provided in the outer surface of a ring (41) that connects the bending portion (42) to the soft portion (40).
