PROBLEM TO BE SOLVED: To improve sterilization effect of a resin container by use of hydrogen peroxide.SOLUTION: A corona discharge processing including: a voltage application step of applying a voltage which is generated by corona discharge to an electrode 11 which can pass an opening of a resin container B； an insertion step of inserting the voltage applied electrode into the resin container through the opening； and a bottom processing step of an inner surface of the resin container in such a manner that the electrode approaches the bottom of the resin container until a mode of corona discharge from the electrode is changed. After said corona discharge processing is carried out for the inner surface of the resin container, sterilization treatment including a hydrogen peroxide supply step of spraying mist or gas of a hydrogen peroxide solution or a mixture thereof onto the resin container is carried out for the resin container.SELECTED DRAWING: Figure 1
