To simplify the work such as washing, waxing, showering and spraying by use of a simple washing-water discharge device capable of being compactly housed in the truck of a car, even in the place where there is no power supply, water faucet, or the like, without drawing around a wire, hose, or the like, and also without impairing the external appearance of the car.

This water-discharging device is constituted in such a way that the air put in by an inflator device 1 is accumulated at a high pressure in a high-pressure closed vessel 2, and this high-pressure air is supplied to a regulator 3 for reducing it to a constant low pressure, and the air reduced to a constant low pressure is supplied to a low-pressure closed vessel 4 in which water and washing liquid has been previously stored, for pressurizing them by the air, and the water and washing liquid is jetted by means of an end washing-water discharge device 6. Further, the end washing-water discharge device is provided with a discharge lever 6a installed in a position easy to operate, and also with a washing surface 6d contrived not to damage the washed surface at the time of washing and waxing.