Method for regenerating ion exchanger

A method for regenerating an ion exchanger which covers a surface of a processing electrode or a feeding electrode and is used in electrolytic processing that includes bringing the ion exchanger close to or into contact with a workpiece while applying a voltage between the processing and the feeding electrode to process a surface of the workpiece, said method comprising:

• providing a regeneration section including a partition, a regeneration electrode to be disposed at a position facing the ion exchanger and the processing electrode or feeding electrode covered with the ion exchanger such that the partition is disposed between the ion exchanger and the regeneration electrode, and a discharge portion formed between the partition and the regeneration electrode;
• and
• positioning the regeneration section such that the partition of the regeneration section is brought close to or into contact with a surface of the ion exchanger covering the processing electrode or feeding electrode;
• and
• applying a voltage between the regeneration electrode and the processing electrode or feeding electrode covered with the ion exchanger while supplying a liquid into the discharge portion and also supplying a liquid between the partition and the processing electrode or feeding electrode covered with the ion exchanger, thereby regenerating the ion exchanger.