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