The ozone generator's function is used to make healthier and cleaner human environment. The deodourizing and sterilizing effects of ozone have been accepted in the field of water and wastwater treatment, medical activity, and food market. The purpose of development is to design a compact sized ozone generator such as used in a refrigerator. In this case, it must have a simple construction, a safe operation and a stable discharge condition. It seems to be satisfied by using a ceramic transformer as a high voltage power supply and needles to a plane electrode. The ceramic transformer has such characteristics that higher step up ratio and lower input impedance are obtaind against the higher load impedance. This gives the ozone generator merits of self current regulation and over current protection without any regulation circuits. There is a benefit in fact that voltage across the electrode drops when impedance between electrodes becomes low. In this paper, the ozone generator employing a ceramic transformer and a 4 times voltage rectifier will be described.