A polymer electrolyte fuel cell includes a power generation part as an electrolyte membrane-electrode assembly formed of a solid polymer electrolyte membrane, a fuel electrode arranged in contact with one side of the solid polymer electrolyte membrane and an oxygen electrode arranged in contact with the other side of the membrane, and a fuel supply part for storing and supplying an alcohol fuel to the fuel electrode. The fuel supply part is composed of a high-concentration fuel tank for storing and supplying a highly-concentrated fuel and a water fuel tank for storing and supplying a water fuel. The fuel is gasified and supplied to the power generation part through a fuel gasification/supply layer provided between at least the high-concentration fuel tank and the fuel electrode.