PROBLEM TO BE SOLVED: To provide novel cosmetic compositions having a skin moisture retention effect and reduced stickiness.SOLUTION: The present invention provides use of 4-alkyl oxazolidinone-2-one, shown in the following chemical formula, as a cosmetic agent for preparing a skin moisture retention cosmetic product [where substituent R is selected from a linear or branched alkyl group containing 4-24 carbon atoms, preferably 4-18 carbon atoms, and a linear or branched alkylene group containing 4-24 carbon atoms, preferably 4-18 carbon atoms].SELECTED DRAWING: None【課題】保湿効果を有し、かつべとつきが少ない化粧品組成物の提供。【解決手段】下記化学式で示す４－アルキルオキサゾリジン－２－オンの、保湿化粧品組成物製造用の保湿化粧剤としての使用。［式中、置換基Ｒは、４個～２４個の炭素原子、好ましくは４個～１８個の炭素原子を含む直鎖若しくは分岐鎖アルキル基、又は４個～２４個の炭素原子、好ましくは４個～１８個の炭素原子を含む直鎖若しくは分岐鎖アルキレン基から選択される。］【選択図】なし
