To provide an antidegradant excellent in performance of preventing foods, cosmetics, etc., from being degraded.

The antidegradant includes a compound of a dynamic hydration number of 25 or larger such as maltotriose. Desirably, the antidegradant further contains a water-soluble antioxidant such as rosmarinic acid, vitamin C, ascorbic acid, isoascorbic acid, or a salt thereof (for example, an alkali metal salt or an alkaline earth metal salt), a catechin, or a catechin-containing natural extract.