Fuel cell electrode catalyst layer, a fuel cell electrode, a fuel cell membrane electrode assembly and a fuel cell

Fuel cell electrode catalyst layer of the present invention (13) includes a catalyst (131b), the carrier (131a) carrying the catalyst in contact with at least a portion of the catalyst and a carrier, drying per mole proton donating group containing two or more different proton conducting material of the mass value (133). Then, high proton conductive material of the dry weight value of 1 mole per most proton donating groups of the proton conductive material is in contact with at least a portion of the catalyst, and the largest contact ratio at the surface of the catalyst.