TECHNOLOGY FOCUS - ELECTRONICS - Preferred Component: An electrode catalyst is obtained by supporting oxygen reduction catalyst to a support having electroconductivity.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Compound: The transition metal is scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, iridium, platinum and/or gold.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compound: The ligand is imidazole, pyrazole, thiazole, isothiazole, selenazole, isoselenazole, oxazole, isoxazole, furazan, 1,2,3-triazole, 1,2,4-triazole, pyrazine, pyrimidine, pyridazine, trithiane, 1,8-napththyridine and/or pteridine. An electroconductive imparting agent is added to the oxygen reduction catalyst.    TECHNOLOGY FOCUS - POLYMERS - Preferred Compound: The organic polymer compound has ligand in principal chain or side chain. Preferred Process: A portion of hydrogen in the principal chain or side chain of the organometallic polymer structure is substituted by alkyl group and/or vinyl group, halogen and/or sulfonic acid group or amino group, imino group, carboxyl group, hydroxyl group, oxime, ketone, aldehyde group, thiol, phosphine, arsine, selenide, thio carboxyl group, dithio carboxyl group and/or dithio carbonyl group. A metal is coordinated to the metal ligand in which a portion of hydrogen in the principal chain or side chain is substituted by functional group. An electron-accepting dopant or an electron-donating dopant is doped to principal chain of the organometallic polymer structure. EXAMPLE - 2,2'-dibromo-5,5'-bipyrimidine, bis(1,4-cyclooctadiene)nickel, 1,5-cyclooctadiene and bipyridine were dissolved in dimethyl formaldehyde. To the mixture, dimethylfuran was added and stirred at 60 degrees C for 2 hours to obtain yellow precipitate. The precipitate was washed with toluene, ethylenediaminetetraacetic acid and sodium hydroxide, and distilled to obtain polymer. The polymer was dissolved in toluene solution, and bis(1,5-cyclooctadiene)nickel was added. Dimethylformamide solution containing polymer and dibromide iron were mixed, dissolved in bis(1,5-cyclooctadiene)nickel-toluene solution, filtered and vacuum-dried to obtain oxygen reduction catalyst.