PURPOSE: To obtain a screw nail capable of preventing generation of driving resistance to be produced by burring.

CONSTITUTION: In a screw nail provided with spiral grooves 2, 3, 4 whose spiral directions are different from one another on the peripheral surface of a nail. shaft part 1, and having a pointed tip 5 of the nail screw part 1, burrings 6 formed on both sided of the tip 5 in forming of the tip 5 of the nail shaft part 1 are formed inside the locus of the outermost side parts 7 farthest from the center of the tip 5 rotated around the nail shaft part 1.