An object of the present invention is to provide an artificial nail composition which can improve adhesion between a natural nail and an artificial nail, and also can suppress exfoliation or detachment. The artificial nail composition comprises: (a) a compound having at least one radical polymerizable unsaturated double bond in the molecule, (b) an acidic phosphorus compound having at least one radical polymerizable unsaturated double bond in the molecule, and (c) a radical polymerization initiator.
