It is desirable to provide a medicament and a nutritional food to improve skin conditions and to create fulfilling life for people who are not satisfactory about their skin conditions. Specifically, one object of the present invention is to provide an orally administered agent, a food and drink, or a food additive which can be used for improving skin condition. An orally administered agent, a food and drink, or a food additive for improving skin condition, comprising ornithine or a salt thereof as an active ingredient can be provided according to the present invention.