<;P>;PROBLEM TO BE SOLVED: To provide an oxidation catalyst for sterilization/disinfection, which has an excellent oxidation promoting effect and exhibits a high sterilizing/disinfecting effect with a minute amount and to provide an oxidation catalyst particle for sterilization/disinfection containing the oxidation catalyst. <;P>;SOLUTION: The oxidation catalyst for sterilization/disinfection contains (a) a chelating agent having &le;5 coordination positions and/or an anion derived from the chelating agent and (b) a copper compound. The oxidation catalyst particle for sterilization/disinfection contains the oxidation catalyst for sterilization/disinfection and (c) a binder compound. <;P>;COPYRIGHT: (C)2009,JPO&INPIT