The present invention aims to provide an external dermal composition for anti-ageing, which prevents or improves apparent skin problems such as age-related or senescent wrinkles, fine wrinkles, saggings, spots, etc., as well as maintaining or enhancing the skin barrier functions. The object is solved by providing an external dermal agent for anti-ageing, which contains as an effective ingredient(s) one or more members selected from the group consisting of adenosine N1-oxide 5'-phosphate, analogues thereof, and their salts.