Orally administered agents, foods and drinks, feeds, food additives or feed additives for preventing or treating a dry state of the skin accompanied by atopic dermatitis, xeroderma, chapped hand, chapped skin and the like are provided. The present invention can provide orally administered agents, foods and drinks, feeds, food additives or feed additives for preventing or treating a dry state of the skin, which comprise hydroxyproline, an N-acyl derivative of hydroxyproline, especially an N-acetyl derivative, an N-propionyl derivative, an N-butyryl derivative, an N-isobutyryl derivative, or a salt thereof as an active ingredient.