[en] The soft materials, which are used as the main materials of cosmetics, self-assemble into various nanostructures depending on the external condition such as concentration, additives, temperature, and pH. The cosmetics, which is made of soft materials, can have a variety of properties according to their nanostructures. Therefore, it is essential to resolve the nanostructure of soft materials for the development of a new product in cosmetics. In this project, therefore, we characterized the nanostructure of the soft materials (surfactants, polymer, etc.) used to the raw materials of cosmetics and applied it to develop a new product and to enhance the production process in cosmetics. Furthermore, we tried to develop the new nanostructure probing methods and applied it to characterize the nanostructure of various soft materials. For this purpose, we used the various nanostructure probing methods such as neutron and X-ray small angle neutron scattering techniques, Dynamic Light Scattering, polarized optical microscopy, etc.