An artificial nail is disclosed, which can increase the adhesive force between a French-nail manicure and the artificial nail and prevent a French-nail decoration from being damaged. The artificial nail includes an upper surface having a rough portion, a French-nail decoration formed on the rough upper surface, an adhesive layer having a strong adhesive force interposed between a French-nail manicure and the upper surface having the French-nail decoration. Also, the artificial nail set includes a tree having plurality of branches branching off from both sides of the tree and a plurality of artificial nails, each of which is detachably coupled to each end portion of the branches and has the above-described construction. The French-nail decoration formed on the artificial nail has a prolonged lifetime because it is prevented from being peeled off, worn or damaged (abraded).