A sprayer sprays a chemical liquid from a spraying section (30). Liquid detecting electrodes (55, 56) disposed in the spraying section (30) detect the amount of liquid in a liquid storing section (30a). If a liquid reduction is judged, a pin (27) is actuated by a solenoid (26) to feed a liquid chemical into the liquid storing section (30a) of the spraying section (30) from a chemical liquid bottle (20) through a liquid feed pipe (25). When chemical liquid is to be fed at intervals, the liquid feed interval is found and the feed power to a piezoelectric element (50) in the spraying section (30) is controlled so that the liquid feed interval may be constant. As a result, it is possible to provide a spraying device that is capable of automatically controlling the spraying rate per unit time to constant amounts for spray liquids of various properties.
