Abstract: A composition including a lamellar gel phase contains a first nonionic surfactant having hydrophobic moieties respectively on both sides of a hydrophilic moiety. The first nonionic surfactant constitutes at least a portion of the lamellar gel phase. A content by percentage of higher aliphatic alcohols or higher fatty acids is 1% by mass or less relative to the mass of the composition.

Abstract: An object of the present invention is to provide, regarding a composition containing a nanodisc composed of a silicone-based surfactant, a nanodisc-containing composition having an improved stability of an emulsion composition. For achieving the object, provided is an oil-in-water emulsion composition containing (A) an aqueous phase, (B) an oil phase, and (C) polyoxyalkylene-modified silicone. When the oil-in-water emulsion composition contains 1 to 35% by mass in total of ethyl alcohol and dipropylene glycol in (A) the aqueous phase, 1 to 50% by mass of (B) the oil phase, and 0.2 to 5% by mass of (C) based on the whole composition, a nanodisc is formed and the emulsion state is stable.