Fuel cell and gas diffusion electrode used for fuel cell

Fuel cell comprising a pair of catalyst layers sandwiching a proton conductive electrolyte membrane, wherein the catalyst layer is at least a cathode containing a catalyst component, a mixture of electrolyte material and a carbon material constituting, and the carbon material by the load of the catalyst a carbon catalyst support material component and a gas diffusion carbon material not supported catalyst component of the above-described configuration, the catalyst-carrying carbon material at 25 deg.] C and a relative humidity of 90% the amount of adsorption of water vapor was 50mL / g or more.