A bicell structure that can be prepared safely and simply without using an organic solvent, and has excellent usability (penetration, moisturizing, firmness) as an external preparation for skin, and excellent storage stability. Providing a body composition. The following components (a) to (e); (a) phospholipid, (b) cholesterol and / or phytosterol 0.02 to 1% by mass, (c) the average added mole number of ethylene oxide is 10 to 20, At least one surfactant selected from polyoxyethylene cholesteryl ether and / or polyoxyethylene phytosteryl ether, (d) at least one dihydric alcohol selected from propylene glycol, dipropylene glycol and 1,3-butylene glycol; (E) water, and the mass ratio (a) / (c) of the component (a) to the component (c) is 0.4 to 2.0, and the component (a) relative to the component (b) (a ) And the total mass ratio {(a) + (c)} / (b) of the component (c) is 5.0 or more.
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