It is intended to provide a moisturizer, an antiaging agent, an antiobesity agent, an antioxidant agent and an antiinflammatory agent which contain an active ingredient originating in a natural material and are applicable to a skin preparation for external use, a food and a drink. Namely, a moisturizer, an antiaging agent, an antiobesity agent, an antioxidant agent and an antiinflammatory agent which comprise an extract of a plant belonging to the genus Aster of the family Compositae.
