The present invention provides a water-based skin cosmetic comprising the following ingredients (A) and (B) : (A) A compound represented by the following formula (I) (In this formula, 1 and m can be either the same or different； each denotes an integer 10-25.) (B) A thickener composed of microgel obtained by using a composition that has an organic solvent or oil component as the dispersion medium and water as the dispersion phase, dissolving a water soluble ethylenically unsaturated monomer in the dispersion phase, and radically polymerizing it in the dispersion phase, wherein said microgel is obtained by radically polymerizing dimethylacrylamide and 2-acrylamido-2-methylpropane sulfonic acid under the conditions in which single phase microemulsion or fine W/0 emulsion is formed by using a surfactant.
