NOVELTY - A solid polymer type fuel cell (11) comprises proton conductive polyelectrolyte film (12); and a gas flow channel (15, 15') for supplying gas to the anode electrode (13) and the cathode electrode (14). The gas diffusion layer (142) included in the cathode electrode is constructed of a carbon-containing material and the surface of the carbon-containing material is modified to be hydrophilic.    USE - For use as phosphoric or molten carbonate type fuel cells.    ADVANTAGE - The invention is capable of keeping a polyelectrolyte film in a wet state and continuously supplying gas into a catalyst layer in efficient manner to allow an increase in the efficiency of the cell and to cut operation costs.    DETAILED DESCRIPTION - A solid polymer type fuel cell comprises a proton conductive polyelectrolyte film; an anode electrode and a cathode electrode arranged on the opposite sides of the polyelectrolyte film; and a gas flow channel for supplying gas to the anode electrode and the cathode electrode. The anode electrode and the cathode electrode each includes a catalyst layer that is in contact with the polyelectrolyte film and a gas diffusion layer for diffusing the gas supplied from the gas flow channel to the catalyst layer. The gas diffusion layer included in the cathode electrode is constructed of a carbon-containing material and the surface of the carbon-containing material is modified to be hydrophilic.    An INDEPENDENT CLAIM is also included for manufacture of a solid polymer type fuel comprising forming an anode electrode and a cathode electrode on both sides of a proton conductive polyelectrolyte film and forming gas flow channels on the outsides of the anode electrode and the cathode electrode.    DESCRIPTION OF DRAWING(S) - The figure is a cross-sectional view for illustrating an example of a solid polymer type fuel cell.    Solid polymer type fuel cell (11)    Polyelectrolyte film (12)    Anode electrode (13)    Cathode electrode (14)    Gas flow channel (15, 15')    Gas diffusion layer (142)