PROBLEM TO BE SOLVED: To provide an external composition for skin which has improved dissolution stability of a benzylidene azolidine derivative and a salt thereof which has ultraviolet A absorption, and is a hydrophilic, neutral compound also with safety to the skin.SOLUTION: The invention relates to an external composition for skin containing (A) a benzylidene azolidine derivative represented by formula (I), or a salt thereof, (n is an integer of 1-5 A1 is O, S, or N-A4 A2 to A4 are each independently H, an alkyl group which may be substituted by a hydroxyl group, or the like) (B) a glycol compound and (C) hydroxyalkyl urea, a surfactant with an HLB value of 8 or more, an organic solvent having a ring structure miscible with water, or an organic acid and a derivative thereof.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】紫外線A吸収作用を有する、親水性且つ皮膚にも安全な中性の化合物であるベンジリデンアゾリジン誘導体及びその塩の溶解安定性を向上させた皮膚外用組成物の提供。【解決手段】(A)式(I)で表されるベンジリデンアゾリジン誘導体またはその塩と、(nは1~5の整数;A1はO、S、又はN-A4;A2~A4は各々独立に、H、ヒドロキシル基で置換されていてもよいアルキル基等)(B)グリコール化合物並びに(C)ヒドロキシアルキル尿素、HLB値8以上の界面活性剤と、水と混和性のある環状構造を有する有機溶剤又は有機酸及びその誘導体と、を含む皮膚外用組成物。【選択図】なし
