To obtain a metal cord capable of increasing stiffness without lowering resistance to separation performance in a metal cordcrossing belt layer in order to enhance steering stability performance of pneumatic radial tire for passenger car and obtain a radial tire using the metal cord.

In single fiber metal cord 4 having circular or nearly circular cross section, a width-spreading part G whose cross sections are crushed into ellipse (long diameter: B and short diameter: C) or elliptical shape is formed at intervals in the longitudinal direction of cord, and the single fiber metal cords 4 are arranged so as to position on a same line in metal cord embedded rubber layer forming a belt to constitute radial tire.