NOVELTY - A fuel cell comprises polymer electrolyte (1) disposed between anode (3) for oxidizing fuel/cathode (4) for reducing an oxidizing agent, so that an assembly is formed, pair of gas diffusion layers each disposed at one side of anode and cathode, bipolar plate for providing fuel to one of diffusion layers and another plate for providing other of agent to diffusion layer, where layer has porous gas diffusion layer substrate which is subjected to surface treatment with hydrophilic agent to form hydrophilic surface layer. Particles of water-repellent material are dispersed in substrate pores.    USE - As fuel cells (claimed) such as polymer electrolyte fuel cells useful as alternate for internal combustion engines that operate with burning of fossil fuels; as clean power generation system; as distributed power sources and as power sources for electric automobiles; in high-energy density power sources for mobile devices.    ADVANTAGE - The fuel cell has improved drainage performance of produced water in gas diffusion layer thereby generating power with high performance. The fuel cell exhibits higher cell voltage and higher power at a high current density; prevents flooding and shows longer cell lifetime. The surfaces of the members constituting the porous gas diffusion layer substrate is hydrophilized so that produced water rapidly creeps and moves along the surfaces of the members constituting the porous gas diffusion layer substrate and thereby improving drainage performance of the produced water from the electrode. The fuel cell yields a higher cell voltage at a high current density and outputs a greater electric power.    DETAILED DESCRIPTION - A fuel cell comprises an anode (3) for oxidizing a fuel, a cathode (4) for reducing an oxidizing agent, a polymer electrolyte (1) disposed between the anode and the cathode, so that an assembly is constituted by the anode, polymer electrolyte and cathode, a pair of gas diffusion layers each disposed at one side of the anode and at one side of the cathode of the assembly, a bipolar plate for providing the fuel to one of the gas diffusion layers and another bipolar plate for providing the other of the oxidizing agent to the gas diffusion layer, where at least one of the gas diffusion layers includes a porous gas diffusion layer substrate which is subjected to surface treatment with a hydrophilic agent to form a hydrophilic surface layer, where particles of a water-repellent material are dispersed in pores of the porous gas diffusion layer substrate.    DESCRIPTION OF DRAWING(S) - The figure shows cross-sectional view of fuel cell.    Polymer electrolyte (1)    Anode (3)    Cathode (4)    Gaskets (6)    Anode-bipolar plate (23)    Cathode-bipolar plate (24)    Anode-gas diffusion layer (53)    Cathode-gas diffusion layer. (54)