To obtain a skin cosmetic composition having a largely improved viscosity stability at a high temperature by compounding a system consisting of a plant extract and a carboxyvinyl polymer with a specific metal salt.

One or more than one kind of plant extract and a carboxyvinyl polymer is compounded with one or more than one kinds selected from water-soluble alkali metal salts of organic acids or inorganic acids to adjust the viscosity at 500-3000cps. The plant is preferably Ganoderma Iucidum, mugwort, chamomilla, rosemary, aloe, hamamelis, licorice or Swertia japonica. Further, the pH of the composition is preferably 4-6. The metal salt is preferably trisodium citrate, monosodium phosphate, disodium phosphate, potassium phosphate, dipotassium phosphate or sodium succinate. The plant extract is compounded in an amount of about 0.001-5wt.% based on the total amount and the polymer is added in an amount necessary to make the viscosity to 500-3000cs. The metal salt is compounded at 0.01-1wt.%. The cosmetic is useful as a solubilized-type skin cosmetic.