In a filling machine for carbonated drinks, many bubbles are generated, causing the vessels to overflow. As a result, only a small volume of drink is left in the vessel, and the vessel is dirtied. For breaking these bubbles, some bubble breaking methods were investigated experimentally. Finally, it was discovered that the method using aerial ultrasonic waves was the best of all for the filling machines. A bubble breaking machine utilizing aerial ultrasonic waves has been developed. It consists of an ultrasonic vibrator, a metallic horn, a rectangular plate, partition plates, and a reflection plate. The rectangular plate is designed to vibrate in the stripes mode, which is the most efficient radiation mode. The partition plates are set perpendicular to the node lines of the stripes mode, so many pistons are produced by the partition plates. The reflection plate concentrates sound radiation from one piston at one particular point. The equipment was applied to a filling machine of carbonated drinks and the desired results were obtained.