The method of manufacturing the exhaust gas purifying catalyst and an exhaust gas purifying device

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Provided is a method for manufacturing a catalyst for exhaust gas cleaning with a low initiation temperature for carbon combustion. The method is for manufacturing a catalyst for cleaning exhaust gas that contains composite oxides containing cerium and rare earth elements other than cerium, silver and/or oxides of silver from dissolution processes that manufacture solutions by dissolving compounds containing silver, compounds containing cerium, and compounds containing rare earth elements other than cerium (A) or cerium, compounds containing rare earth elements other than cerium, and compounds containing silver (B) in an aqueous solution of lactic acid and drying and sintering processes for drying and sintering those solutions.