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.
