To reduce the size and cost of large-capacity ozone generator apparatuses and improve the maintainability thereof. An ozone power supply comprises an n-phase inverter for converting to an AC voltage of a predetermined frequency to output an n-phase AC voltage waveform; n reactors and an n-phase transformer for converting the n-phase AC voltage to an n-phase AC high voltage; n high voltage terminals for outputting the n-phase AC high voltage; and a single low voltage terminal having a common potential. A plurality of ozone generator units are electrically separated in respective ones of n discharge chambers. N high voltage electrode terminals led out of the respective ozone generator units are connected to the n high voltage terminals, while a single low voltage electrode terminal connected commonly to all of the low voltage electrodes of the ozone generator units is connected to the single low voltage terminal, whereby the ozone generator units are caused to generate an n-phase AC discharge, thereby generating ozone.