An exhaust gas purifying catalyst of the present invention contains alumina, and ceria loading palladium and platinum, and the ratio of palladium oxide to palladium oxide by peak separation of the 3d orbital of palladium in X-ray photoelectron spectroscopy is within a range from 70:30 to 99:1. An input channel and a job ticket are defined. The polyhydroxycarboxylic acid unit has an optical purity of not greater than 80%, wherein the optical purity is defined as the absolute value of difference between the mole percentage of a L-monomer in the optically active monomer and the mole percentage of a D-monomer in the optically active monomer.