To provide an ozone water manufacturing device which can dissolve ozone to a high concentration and obtain ozone water from which the ozone does not escape for a long time.

The ozone water manufacturing device comprises a pressurizing part 1 for pressure feeding water, an ozone injection part 2 for injecting the ozone into water, a pressurized dissolution part 3 which can dissolve the ozone into water by a pressurizing action to feed the water containing the injected ozone under pressure with the help of the pressurizing part 1, and a pressure reduction part 4 which can successively reduce the pressure of the ozone water containing the ozone dissolved by the pressurized dissolution part 3 to an atmospheric pressure level from the inflow side toward the outflow side of the ozone water. The continuous supply of the ozone water to the pressure reduction part 4 can be achieved by continuously operating each part, i.e. the pressurizing part 1, the ozone injection part 2 and the pressurized dissolution part 3. Thus, the generated air bubble-free ozone water is continuously discharged from the outflow side of the pressure reduction part 4.