Emulsions are essential formulations for cosmetics, and are the basis of product functions, properties, and usability. Many emulsification technologies have been developed and have contributed to the advancement of cosmetics. In this article, the product development research I have experienced, as well as the distinctive emulsification technologies developed by researchers associated with me, and how they have been applied to cosmetics will be introduced. Specific examples include: 1）Stabilization of low-viscosity emulsions, 2）Development of a high-oil-containing liquid crystal gel with spontaneous emulsification ability, and its subsequent development, 3）Stabilization of α-gel and formation of multilamellar emulsion in the development of highly moisturizing emulsions, 4）Achieving both long-lasting effect and usability, including high-water-containing W/O emulsions, powder-oriented W/O emulsion（Pickering emulsion）that must be shaken before use, and water-repellent O/W emulsion technologies, will be explained. In addition to technical aspects, various events experienced during the development process are also shown.