The present invention provides a topical dermatological agent that has the effects of moisturizing skin and improving coarse skin, and has excellent touch feeling when used.The topical dematological agent is characterized in comprising a polyoxyalkylene glycol- polyethylene glycol copolymer alky ether derivative represented by formula (I): Y-{O(EO)a/(AO)b-R}k………(I) (wherein, Y is a residual groupof a polyol having 3 to 6 hydroxy groups after removing said hydroxy groups, k is the number of the hydroxy groups of the polyol, EO is an oxyethylene group, AO is an oxyalkylene group having 3 to 4 carbon atoms； the ratio of the oxyethylene group relative to the total mass of the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene group is 20 to 100 mass%； the oxyalkylene group having 3 to 4 carbon atoms and the oxyethylene are randomly added； R’ s may be the same or different and each represents a hydrocarbyl group having 1 to 4 carbon atoms).本發明係提供具有保濕、改善皮膚粗糙之效果及使用觸感優良之皮膚外用劑。該皮膚外用劑之特徵為含有下述通式(I)所示之聚氧伸烷基二醇．聚乙二醇共聚物烷基醚衍生物：Y－{O(EO)a/(AO)b－R}k………(I)(式中，Y為具有3至6個羥基之多元醇除去羥基後之殘基，k為上述多元醇之羥基數，EO為氧伸乙基，AO為碳數3至4之氧伸烷基，1≦a≦70，1≦b≦70；相對於碳數3至4之氧伸烷基與氧伸乙基之合計量，氧伸乙基之比例為20至100質量%；碳數3至4之氧伸烷基與氧伸乙基係以無規狀加成；R可相同或不同，各為碳數1至4之烴基)。
