TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: Before dispersing electroconductive support, a reversed micelle solution (C) containing cocatalyst metal ion is mixed with solution containing platinum and iridium, followed by adding reducing agent of cocatalyst metal ion. Alternately, solution (C) is added to solution (A) before the addition of solution (B). Alternately, the manufacturing method involves adding reducing agent to solution (C), subsequently mixing solution (A) to solution (C), adding reducing agent of iridium ion and adding solution (B). Preferred Compounds: Solution (A) contains iridium chloride. The reducing agent of iridium ion is sodium borohydride. Solution (B) contains dinitramine platinum and/or platinum chloride. The reducing agent of platinum ion is hydrazine, sodium borohydride. The cocatalyst metal ion is chromium, manganese, iron, cobalt, nickel, palladium and/or rhodium.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: Before dispersing electroconductive support, a reversed micelle solution (C) containing cocatalyst metal ion is mixed with solution containing platinum and iridium, followed by adding reducing agent of cocatalyst metal ion. Alternately, solution (C) is added to solution (A) before the addition of solution (B). Alternately, the manufacturing method involves adding reducing agent to solution (C), subsequently mixing solution (A) to solution (C), adding reducing agent of iridium ion and adding solution (B). Preferred Compounds: Solution (A) contains iridium chloride. The reducing agent of iridium ion is sodium borohydride. Solution (B) contains dinitramine platinum and/or platinum chloride. The reducing agent of platinum ion is hydrazine, sodium borohydride. The cocatalyst metal ion is chromium, manganese, iron, cobalt, nickel, palladium and/or rhodium. EXAMPLE - Polyethylene glycol mono-4-nonyl phenyl ether (in g) (66) and cyclohexane (1 l) were mixed and stirred for 2 hours. Iridium chloride aqueous solution (82) was added to form reversed micelle solution (A). Sodium borohydride (0.15) was added and stirred for 2 hours. Then, cobalt nitrate aqueous solution (7.5) was added and stirred for 2 hours. Further, sodium borohydride (0.05) was gradually added and stirred. Platinum chloride aqueous solution (8.2) was added to the above solution. Sodium borohydride (0.15) was gradually added and stirred for 2 hours to form reversed micelle solution (B). Subsequently, EC600JD (carbon black) (1.1) was mixed with cyclohexane (500 ml). The carbon black solution was mixed with reversed micelle solution (B) to form reversed micelle solution (C). Methanol (300 ml) was added. The reversed micelle structure was collapsed and solid content was separated by filtration. The solid content was dried at 85degreesC for 12 hours under reduced pressure to form platinum-iridium-cobalt containing carbon support. A membrane electrode assembly was formed using the obtained carbon support. The electrode assembly was used in a fuel cell. The mass activity of the fuel cell was 185 microamperes/mg-platinum.