Provided is a starting material for cosmetics said starting material being characterized by comprising a core corona type microgel dispersion obtained by radical polymerizing a specific polyethylene oxide macromonomer a specific hydrophobic monomer and a specific cross linking monomer under specific conditions. The purpose of the present invention is to provide a starting material for cosmetics from which a cosmetic having a high stability and a good feeling in use and causing no skin irritation can be easily produced.
