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: Pt nanoparticle is a strong reductant and has been used as an antioxidant in cosmetics and medicine. It was reported to have catalase‐like activity, which converts hydrogen peroxide to water and oxygen. However, in this study, freshly prepared Pt nanoparticle was almost inert towards decomposing hydrogen peroxide. The catalase‐like activity of Pt nanoparticle increased with increasing weeks of storage at room temperature and became more significant when the Pt nanoparticle was exposed to air. No hydroxyl radical formation was confirmed by several methods such as ESR spin‐trapping, dimethyl sulphoxide oxidation, salicylic acid hydroxylation and hydroxytoluene oxidation, indicating that the decomposition of hydrogen peroxide proceeds by the two‐electron oxidation/reduction reaction. The oxidatively deteriorated Pt nanoparticle catalytically decomposed ascorbic acid, which is one of the most important biological antioxidants. We found that such oxidation was effectively prevented by the addition of Pd nanoparticle. We also discussed the reaction mechanisms and application of Pt nanoparticle.