There is provided an anti-degradation agent capable of exhibiting an excellent degradation-inhibiting property for foods, cosmetics, etc. The anti-degradation agent contains a compound having a dynamic hydration number of not less than 25 such as maltotriose. The anti-degradation agent preferably further contains a water-soluble antioxidant such as rosmaric acid, vitamin C, ascorbic acid, isoascorbic acid and a salt thereof (for example, alkali metal salts, alkali earth metal salts, etc.) as well as catechins and catechin-containing natural extracts.
