PURPOSE: To provide an excellent self-cutting ability to an artificial tooth root which has a sufficiently high strength and an excellent rotation-checking ability so as to be stable.

CONSTITUTION: An anchor part 1 of an artificial tooth root is tapered, and is formed at its outer peripheral surface with threads 3, and the longitudinal cross section of the anchor part 1 is defined by a quadratic curve so that the contour of the surface excepting the threads bulges outward, and a series of notches 4 are formed, having its length greater than intervals 5 of the notches, in the threads 3.