A dust-collecting pipe for a vacuum cleaner can efficiently and easily clean an area such as the top surface of a wardrobe, an area under the wardrobe, or a heat radiator of a refrigerator, which are not easily reachable by the suction port of the dust-collecting pipe. The protective tube is fixed to the base with a double fall-off prevention structure, and latched to the base when a force including gravity and inertia acts on the protective tube toward the closed end of the protective tube in the axial direction thereof. The swivel support portion 100 is self-supported and fixed within the water chamber, and turns the slide table 200 connected thereto. The sealing component has an axial cylindrical wall and a radial annular flange.