70 to 90% by mass of at least one compound selected from the group consisting of ω3 polyunsaturated fatty acids, pharmaceutically acceptable salts thereof and esters thereof, when the total amount of the self-emulsifiable composition is 100% by mass, 3 to 40 parts by mass of 100 parts by mass of a polyethylene sorbitan fatty acid ester (optionally including polyoxylpyrimidine free, but excluding lecithin) and? 3 polyunsaturated fatty acid as an emulsifier of 6 mass% and 1 to 29 mass% A self-emulsifying composition containing lecithin in a mass part is excellent in self-emulsifying property, composition dispersibility, emulsion stability and water absorbability, and is free of ethanol and polyhydric alcohol, or has a low added concentration. The self-emulsifying composition is useful for foods and medicines.
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