An endoscope includes: a rigid distal structure portion; a rotational portion; an exterior member; a bearing opposed to the exterior member and recessed from an outer surface of the distal structure portion, the bearing being; and a preventing portion. The bearing is configured to receive and support the rotational shaft and to displace the rotational shaft from the distal structure portion by the exterior member being removed from the distal structure portion. The preventing portion provided on one of the rotational portion and the distal structure portion, and configured to prevent disengagement of the rotational portion by coming in contact with the other of the rotational portion and the distal structure portion when the rotational shaft is displaced from the bearing.