NOVELTY - A solid polymer electrolyte fuel cell comprises gas-tight electrically insulating layers are provided on separator (4) in the insides of the laminated unit cells, to give a gas-tightness between the electrode and separator, where each of the separators has a gas-distributing groove and the gas-distributing groove is connected to the unit for supplying and distributing the fuel gas by the gas-tight electrically insulating layer, where the layer is gas-tight non-metallic material, the gas-tight non-metallic material is configured to form ribs providing grooves for guiding the gas.    USE - As solid polymer electrolyte fuel cell (claimed), used in portable power sources, power sources for electric vehicles, household cogeneration systems.    ADVANTAGE - The polymer electrolyte fuel cell has an improved gas-sealing property between the outer manifolds and the flanks of the laminated unit cells. It is possible to realize a simplification in the assembling steps. Since a metallic separator made of stainless steel or the like can be used without any machine tool cutting, reduces the manufacturing cost at a mass-production. Since the separator can be made thinner, it also contributes to realize the compactness of the laminated unit cells.    DETAILED DESCRIPTION - A solid polymer electrolyte fuel cell comprises unit cells laminated while placing electrically conductive separators (4) between them, where the unit cell comprising an electrode having a pair of catalytic reaction layers (2) which sandwich a solid polymer electrolyte film (3) between them, unit for supplying and distributing a fuel gas mixture containing hydrogen to one surface of the electrode, and unit for supplying and distributing an oxidant gas containing oxygen to the other surface of the electrode, where gas-tight electrically insulating layers are provided on the separator in the insides of the laminated unit cells, thus to give a gas-tightness between the electrode and separator, where each of the separators has a gas-distributing groove and the gas-distributing groove is connected to the unit for supplying and distributing the fuel gas by the gas-tight electrically insulating layer, the layer being a gas-tight non-metallic material, the gas-tight non-metallic material is configured to form ribs providing grooves for guiding the gas for supplying and distributing the fuel gas to the gas-distributing groove, where each of the separators is composed of a metallic plate having the gas-distributing groove.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of structure of polymer electrolyte fuel cell.    Catalytic reaction layers (2)    Solid polymer electrolyte film (3)    Separator (4)    Gas flow paths (5)    Gas-tight electrically insulating layers (11)