PROBLEM TO BE SOLVED: To secure a stable antifouling property even when the anode for electrolysis deteriorates somewhat, in a method for preventing adherence of marine organism (antifouling) on a structure contacting with seawater, by generating oxygen through an electrolysis while restraining generation of chlorine. SOLUTION: This antifouling device is characterized by maintaining not only potential difference in a predetermined range with an automatic potential controlling part 7c, but also antifouling current in a predetermined range with an auxiliary automatic current controlling part 7d, when supplying antifouling current to the anode 4 and a cathode 8.
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