Abstract: Herein is disclosed an oily material composition comprising, as effective components, both a specific alkyl or alkenyl ester of an N-long chain acyl neutral amino acid and a specific sterol ester of an N-long chain acyl neutral amino acid, or further an amphipathic substance in addition to the said two kinds of esters, which composition has both good moisturizing property and good moisture-permeating property, as well as good water-incorporating property and good emulsification stability, and shows a good feel on use (i.e., non-stickiness, good compatibility, no heavy touch and good spreadability), and shows, when incorporated in a cosmetic composition or a dermal external agent composition, an advantage of giving moisturizing property and moisture-permeating property as well as emulsification stability thereto and of giving a good feel on use.

Abstract: Herein are disclosed N-long chain acyl-neutral amino acid polyglycerin esters composed of a polyglycerin having a degree of glycerin polymerization of not smaller than 4 and an N-long chain acyl-neutral amino acid having an acyl group with from 6 to 22 carbon atoms and a nonionic surfactant composition comprising, as an active ingredient, at least one of said N-long chain acyl-neutral amino acid polyglycerin esters, which are favorably safe and which, when incorporated in cosmetic compositions or percutaneous preparations, are sensorially good.