Ozone generating apparatus

An ozonizer including a power supply and an ozone generator configured to generate ozone gas in accordance with a power source output of the power supply, the ozonizer comprising:

• a concentration detector configured to detect, as a detected ozone concentration, a concentration of ozone in the ozone gas generated by the ozone generator;
• and
• a control device,
• the control device including a storage configured to store two or more functions indicating a relationship between the power source output and an ozone concentration corresponding to the power source output in accordance with different gas flow rates in the ozone generator,
• the control device obtaining a first power source output corresponding to a set ozone concentration and a second power source output corresponding to the detected ozone concentration based on the set ozone concentration of the ozone generator, an index indicating the gas flow rate of the ozone generator, the detected ozone concentration, and the two or more functions, and executing feedback control of controlling the power source output based on a difference between the first power source output and the second power source output.