NOVELTY - A fuel cell is manufactured by catalyst layer formation process which forms anode side or cathode side catalyst layer with to-be-processed composition which contains platinum (8), cation exchange resin (11) and noble metal(s) (9) in one surface side of electrolytic membrane and forms cathode side or anode side catalyst layer to other surface side of electrolytic membrane which to-be-processed composition may not be even so that counter electrode may be comprised.    USE - Manufacture of fuel cell.    ADVANTAGE - The method improves catalyst utilization efficiency, reduces cost of fuel cell, and manufactures fuel cell which is excellent in electric power generation performance.    DETAILED DESCRIPTION - A fuel cell is manufactured by catalyst layer formation process which forms anode side or cathode side catalyst layer with to-be-processed composition which contains platinum (8), cation exchange resin (11) and noble metal(s) (9) in one surface side of electrolytic membrane and forms cathode side or anode side catalyst layer to other surface side of electrolytic membrane which to-be-processed composition may not be even so that counter electrode may be comprised, and electric potential application process which varies electric potential of cathode side catalyst layer and/or anode side catalyst layer with to-be-processed composition while maintaining electrolytic membrane to wet condition so that dissolved potential of platinum and/or deposition potential of platinum may be passed from high electric potential side to low electric potential side from low electric potential side to passage and high electric potential side and producing alternation for dissolution and precipitation of platinum by applying electric potential fluctuated from high electric potential side in between dissolved potential of platinum and deposition potential of platinum from low electric potential side to low electric potential side and high electric potential side. The fuel cell has electrolytic membrane, anode which is provided in one surface of electrolytic membrane, cathode which is provided in other surface of electrolytic membrane, anode side catalyst layer, and cathode side catalyst layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a conceptual diagram of the precipitation of platinum in manufacturing method of the fuel cell. (Drawing includes non-English language text).    Gas diffusion layer (3)    Platinum (8)    Noble metal (9)    Carbon particles (10)    Cation exchange resin (11)    Pore (12)