Abstract: One object of the present invention is to provide a cell, a production method for a fuel cell to produce a polymer electrolyte fuel cell having high electric generating performance, the present invention provides a cell for a fuel cell comprising an electrolyte membrane, conductive porous members in a sheet shape or a plate shape which are laminated so as to sandwich the electrolyte membrane, and contains an ion catalyst at least the electrolyte membrane side, and separators in a sheet shape which are laminated so as to sandwich the electrolyte membrane and conductive porous members and comprises a supplying opening and a discharging opening for fluid, wherein at least one of the conductive porous members is a conductive fiber-containing porous member comprising a binder resin and conductive fibers, and the conductive fiber-containing porous member comprises an orientation layer in which conductive fibers are orientated along a flow direction of the fluid.

Abstract: The invention provides a gas diffusion electrode that has an excellent ability to repel water so that reaction gas is rapidly supplied and removed, and excellent conductance so that the generated electricity is efficiently transferred, and provides a gas diffusion electrode, a membrane-electrolyte assembly, a polymer electrolyte fuel cell, and methods for producing the same, that retain favorable gas permeability and mechanical strength, and thus can favorably maintain cell properties. A gas diffusion electrode includes a fluororesin film in which at least carbon material has been dispersed, in which the fluororesin has a plurality of voids. A first gas diffusion electrode of the invention includes a porous fluororesin film. A second gas diffusion electrode of the invention has a fluororesin film that has a plurality of through-holes and in which at least carbon material is dispersed.