A cap for an endoscope (1) includes: an outer cylindrical portion (7) that protrudes forwardly from the distal end of an insertion portion (2) of an endoscope and is formed so as to surround the distal end (2) of the insertion portion and a suction path (5) that communicates with an interior side of the outer cylindrical portion (7) and is connected to a suction device (6).
