Polymer electrolyte fuel cell and stack therefor, and method of manufacturing the same

A stack for the fuel cell of the present invention includes a plurality of stacked unit cells each of which includes a conductive separator plate formed with flow passages and manifolds for gas supply, a coupler and attached to both sides of the separator plate and formed with openings and penetrating passages to expose the manifolds and the flow passages, and a membrane-electrode assembly disposed between assemblies of the conductive separator and the couplers.