A self-emulsifying composition which comprises, when taking the total amount of the self-emulsifying composition as 100 mass %, 70 to 90 mass % of at least one compound selected from the group consisting of ω3 polyunsaturated fatty acids, pharmaceutically acceptable salts thereof, and esters of the same, 0.5 to 6 mass % of water and 1 to 29 mass % of an emulsifying agent that comprises a polyoxyethylene sorbitan fatty acid ester (and that further contains a polyoxyl castor oil optionally, with the proviso that the emulsifying agent does not include lecithin) and which contains 3 to 40 parts by mass of lecithin relative to 100 parts by weight of the ω3 polyunsaturated fatty acid or the like. This self-emulsifying composition exhibits excellent self-emulsifying properties, composition dispersibility, emulsion stability and absorbability, and does not contain ethanol or a polyhydric alcohol or contains the same only in a low concentration. The self-emulsifying composition is useful for food and medicine.
