TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The fluoro alkyl group is bonded with the principal chain via a carboxylate ester group. The principal chain does not bond with fluorine. The transmissive layer covers the catalyst and proton-conductive material. The carbon bonded with the carboxylate ester group of the fluoro alkyl group is a primary carbon atom. The fluorine-containing rate (z) of the fluoro alkyl group is 0.3-1, and is measured by a relation: z=x/(x+y), where x is atom number of the fluorine contained in fluoro alkyl group and y is atom number of hydrogen contained in the fluoro alkyl group. The fluoro alkyl group has carbon atom number of 3-15. Preferred Composition: The oxidizing agent electrode is further equipped with a support (31) which supports the catalyst. The fuel cell is further equipped with an electrolyte film (5) interposed and provided at the fuel electrode and oxidizing agent electrode. The oxidizing agent electrode is further equipped with a diffused layer (14) which allows the oxygen to pass through the catalyst.    TECHNOLOGY FOCUS - POLYMERS - Preferred Property: The polymer has molecular weight of 1000-50000. Preferred Composition: The polymer is a polymethacrylic acid 1H, 1H-perfluoro octyl or polyacrylic acid 1H, 1H, 2H, 2H-perfluoro decyl. The polymer layer further contains another polymer (A) having alkyl alcohol ester group with which hydrogen of the carboxyl group is substituted by alkyl group. The alkyl alcohol ester group has carbon atom number of 2-10. The alkyl group is preferably cyclohexyl group. The polymer (A) is a cyclohexyl polymethacrylate. The oxidizing agent electrode is further equipped with an adhesive layer. The adhesive layer contains substance(s) chosen from polyvinyl alcohol, cellulose, epoxy resin, urethane resin, acrylic resin, polyimide resin, agar and albumin. The adhesive layer is formed from a silane coupling agent which is gamma-aminopropyl triethoxy silane. Preferred Method: The solution containing polymer is applied on the oxidizing agent electrode intermediate product by dip-coat method or spray-coat method. The solution is applied on the intermediate product through the diffused layer. The polymer is synthesized from a polycarboxylic acid and using monomer chosen from unsaturated hydrocarbon, unsaturated carboxylic acid and unsaturated alcohol. The polycarboxylic acid is polymethacrylic acid, polyacrylic acid or copolymer of methacrylic acid and acrylic acid. The polymer is obtained by esterifying polycarboxylic acid and fluoro alcohol.