An antiwrinkle agent which is highly effective in alleviating wrinkles caused by the photoaging. The present invention relates to an antiwrinkle agent comprising an N-acetylglucosamine organic acid ester represented by the following general formula (1):wherein R is a linear or branched acyl group having 2 to 18 carbon atoms and the configuration in the 1-position may be either α-form or β-form.