NOVELTY - The polymer electrolyte fuel cell useful as a energy generation device in automotive power generator, comprises a membrane (1), a pair of catalyst layers and a pair of gas diffusion layers, and a porous metal body (4) disposed on one of the pair of gas diffusion layers. The pair of catalyst and gas diffusion layers is disposed to sandwich the polymer electrolyte membrane. A boehmite alumina having an arithmetic mean roughness Ra of 5 nm to 1 mu m is provided on a part of a surface of the porous metal body, which comprises a foamed metal.    USE - The polymer electrolyte fuel cell is useful as an energy generation device in automotive power generators and residential power generators. Can also be used in mobile phones, notebook personal computers and digital cameras.    ADVANTAGE - The polymer electrolyte fuel cell is capable of rapidly absorbing and diffusing water produced in porous metal body and allowing the water to be transpirated into the atmosphere thus enabling a stable operation for a long period of time even at a time of high-humidity/high-current density operation, is clean and quiet, has high-energy conversion efficiency, and increases power generation performances.    DETAILED DESCRIPTION - The polymer electrolyte fuel cell useful as an energy generation device in automotive power generator, comprises a membrane (1), a pair of catalyst layers and a pair of gas diffusion layers, and a porous metal body (4) disposed on one of the pair of gas diffusion layers. The pair of catalyst and gas diffusion layers is disposed to sandwich the polymer electrolyte membrane. A boehmite alumina having an arithmetic mean roughness Ra of 5 nm to 1 mu m is provided on a part of a surface of the porous metal body, which comprises a foamed metal. The boehmite alumina is not provided at a portion in which the porous metal body and a fuel cell member including the gas diffusion layer are in electrical contact with each other. An INDEPENDENT CLAIM is included for a method of producing a polymer electrolyte fuel cell.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic cross-sectional view of a single cell unit of a polymer electrolyte fuel cell.    Polymer electrolyte membrane (1)    Anode catalyst layer (2a)    Cathode catalyst layer (2b)    Anode gas diffusion layer (3a)    Cathode gas diffusion layer (3b)    Porous metal body. (4)