To provide an ozonized water producing apparatus which dispenses with maintenance required so far because special parts are used to mix ozone with water and mixing by a mechanical method is liable to cause a failure.

Ozonized water can be purified without using special parts by supplying gaseous ozone from a pipe 4 to water in a vessel 1 and applying ultrasonic vibration from an ultrasonic generator 2 to the water mixed with ozone in the vessel 1.