Provided is a method for stably sticking a sheet to skin for a long time without giving a skin stress and strange feeling of appearance. In the present disclosure, a self-supporting cellulose membrane having a thickness of not less than 20 nm and not more than 1,300 nm and containing regenerated cellulose having a weight average molecular weight of not less than 150,000 is used, and after applying to skin an aqueous cosmetic agent containing water and at least one polyhydric alcohol and having a content of glycerin of the polyhydric alcohol of 0% by weight to 15% by weight, the cellulose membrane is stuck to the position of the skin on which the cosmetic agent is applied.
