PURPOSE: A carbon monoxide poisoning relieving method of a fuel cell is provided to be able to easily relieve the carbon monoxide poisoning phenomenon of a cathode catalyst generated when a high temperature polymer electrolyte membrane fuel cell uses hydrocarbon gas as fuel. CONSTITUTION: A carbon monoxide poisoning relieving method of a polymer electrolyte membrane fuel cell comprises a step of supplying steam to the cathode of a polymer electrolyte membrane fuel cell. The working temperature of the polymer electrolyte membrane fuel cell is 120-200deg.C. At the working temperature of the polymer electrolyte membrane fuel cell, steam is provided to the cathode of the polymer electrolyte membrane fuel cell. A modified gas supply apparatus supplying modified gas to the polymer electrolyte membrane fuel cell supplies modified gas to the cathode of the polymer electrolyte membrane fuel cell with maintaining steam in the modified gas or adding steam.
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