PURPOSE: To provide an ultrasonic wave generation device which ejects a water current accompanied with an ultrasonic vibration using a water pressure source of about a few Kg/cm2 with the help of a small-capacity pump and injects air bubbles into the water current, and also a broad zone-type ultrasonic wave generation device with a broad frequency zone using only a single water pressure source.

CONSTITUTION: A single piece of nozzle 1 is equipped with a jet outlet 3 which ejects a pressurized water forcefully, a vibration part 5 with a sharp tip counter- positioned to the proceeding direction of the ejected water, and an air pipe 6 which feeds air to an area near the jet outlet 3. In addition, nozzles, each having a different frequency, are connected to a single water pressure source and thus a broad zone-type ultrasonic wave generation device is created.