The present invention provides a novel compound, which acting as a component having a good skin roughness-improving effect, providing good safty and good sense of use, especially free from a sticky sense, a good moisture keeping ability, and increasing the stability of the base.The alkylene oxide derivative is represented by the following general formula (I): Z-{O-[(AO)a-(EO)b]-R}2(I) wherein Z is a residue of a dimerdiol, which hydroxyl group being removed； EO is oxyethylene group ； AO is C3-4oxyalkylene group ； the adducted type of these groups is block type. a and b respectively represents the average adduct moles of the oxyalkylene group and oxyethylene group, 1 ≦ 2a ≦ 150 and 1 ≦ 2b ≦ 150, the ratio of oxyethylene group to the total amount of C3-4oxyalkylene group and oxyethylene group is 10 to 90 mass% ； R is same or different, representing C1-4hydrocarbon group.本發明提供一種新穎化合物，係可作為一種具有改善皮膚粗糙之效果、安全性、使用觸感，特別是不黏膩、濕潤性優良、且可改善主劑安定性之成分。該環氧烷衍生物之特徵為如下述式(I)所示。Z－{O－[(AO)a－(EO)b]－R}2(I)(式中之Z表示從二聚醇中去除羥基後之殘基，EO表示氧伸乙基，AO表示碳數3至4之氧伸烷基，該等之加成形態為嵌段狀。a與b各表示上述氧伸烷基與氧伸乙基之平均加成莫耳數，其中1≦2×a≦150、1≦2×b≦150，相對於碳數3至4之氧伸烷基與氧伸乙基之總和，氧伸乙基之比例為10至99質量%。R為可互為相同或不同之碳數1至4之烴基。)
