The joint (1) of the present invention facilitates connection and disconnection of the motor unit (10) to and from the power cords in the hose (30), and makes the connecting area between these two parts (10, 30) as compact as practicable. In the joint (1), the motor-unit-side connector (4) is arranged projecting from the connecting-end opening of the motor casing (10), whereas the power-cord-side connector (5) is arranged offset from the connecting-end opening of the end cap (20), so that the two connectors (4, 5) are connectable inside the end cap (20).
