The emulsified skin agent for external use of the present invention is characterized in that it comprises a polyglycerine derivative represented by the general formula (1) as follows. In the aspect of oil－in－water skin agent for external use, its emulsion stability, especially its emulsion stability when doped with polar oil or silicone oil, can be improved. Furthermore, in the aspect of water－in－oil skin agent for external use, the use feeling use and the emulsion stability, especially when doped with a hydrophobic treated powder, the dispersion, the emulsion stability and the use feeling of the powder, can be improved.[wherein, m＋2 represents an average degree of polymerization of the polyglycerol and 1≦m≦4；R1is a hydrocarbon group having 1 to 4 carbon atoms or a hydrogen atom；AO is oxyalkylene group having 3 to 4 carbon atoms；and n is an average addition mole number of oxyalkylene group and 1≦m×n≦200].本發明的乳化型皮膚外用劑之特徵在含有可以下述通式(1)表示的聚甘油衍生物。在油中水型皮膚外用劑方面，可改善其乳化安定性，尤其是摻配有極性油或矽油(silicone oil)時的乳化安定性。並且，在水中油型皮膚外用劑方面的使用感及乳化安定性，尤其是摻配有疏水化處理粉體時，可改善粉體之分散性、乳化安定性及使用感。；(式中，m+2表示聚甘油的平均聚合度，而1≦m≦4，R1為碳數1至4的烴基或氫原子，AO為碳數3至4的氧伸烷基(oxyalkylene)，n為氧伸烷基的平均加成莫耳數，1≦m×n≦200。)
