A skin treatment composition of the present invention is an external composition for skin comprising an alkylene oxide derivative expressed by Formula (I): R1O-[(AO)m(EO)n]—R2   (I) wherein AO is an oxyalkylene group of C3 or C4; EO is an oxyethylene group; m and n are 1≦m≦70 and 1≦n≦70 respectively, wherein EO is 20-80% by weight with respect to a total of AO and EU; each of R1 and R2 is a hydrogen or a hydrocarbon group having C1-4. The alkylene oxide derivative (I) has a moisturizing effect, a rough skin improving effect, a stickiness improving effect, and a transdermal absorption promoting effect. When a refreshing agent is used together therewith in the composition of the present invention, the refreshing effect lasts for a long time and it is excellent in feeling of use without skin stimulation.