An endoscope comprising: an insertion unit that has a longitudinal axis; an insertion member (78, 80, 82) that is disposed so as to be inserted into the insertion unit along the longitudinal axis of the insertion unit; a tip portion body that is provided close to a tip of the insertion unit and has a central axis parallel to the longitudinal axis of the insertion unit; a pressing member that is in contact with a base end side of the tip portion body; a protrusion portion (96A, 98A, 100A) that is provided on a tip portion of the insertion member (78, 80, 82) and protrudes outward from an outer periphery of the tip portion of the insertion member (78, 80, 82) in a radial direction; a mounting hole (70, 72, 74) which is provided in the tip portion body and in which the tip portion of the insertion member (78, 80, 82) is inserted and mounted and a first groove portion (70A, 72A, 74A) having a shape corresponding to the protrusion portion (96A, 98A, 100A) is formed and is disposed at a first circumferential position in a circumferential direction around an axial direction of the insertion member (78, 80, 82); and an insertion hole (112, 114, 116) which is provided in the pressing member, into which the tip portion of the insertion member (78, 80, 82) is inserted, and in which a second groove portion (112A, 114A, 116A) having a shape corresponding to the protrusion portion (96A, 98A, 100A) is formed and is disposed at a second circumferential position different from the first circumferential position in the circumferential direction around the axial direction of the insertion member (78, 80, 82). an insertion unit that has a longitudinal axis; an insertion member (78, 80, 82) that is disposed so as to be inserted into the insertion unit along the longitudinal axis of the insertion unit; a tip portion body that is provided close to a tip of the insertion unit and has a central axis parallel to the longitudinal axis of the insertion unit; a pressing member that is in contact with a base end side of the tip portion body; a protrusion portion (96A, 98A, 100A) that is provided on a tip portion of the insertion member (78, 80, 82) and protrudes outward from an outer periphery of the tip portion of the insertion member (78, 80, 82) in a radial direction; a mounting hole (70, 72, 74) which is provided in the tip portion body and in which the tip portion of the insertion member (78, 80, 82) is inserted and mounted and a first groove portion (70A, 72A, 74A) having a shape corresponding to the protrusion portion (96A, 98A, 100A) is formed and is disposed at a first circumferential position in a circumferential direction around an axial direction of the insertion member (78, 80, 82); and an insertion hole (112, 114, 116) which is provided in the pressing member, into which the tip portion of the insertion member (78, 80, 82) is inserted, and in which a second groove portion (112A, 114A, 116A) having a shape corresponding to the protrusion portion (96A, 98A, 100A) is formed and is disposed at a second circumferential position different from the first circumferential position in the circumferential direction around the axial direction of the insertion member (78, 80, 82).