PNEUMATIC RADIAL TIRE

Provided is a pneumatic radial tire in which a fatigue rapture of the steel cord is prevented and durability of a circumferential belt is improved. In a pneumatic radial tire which has as a skeleton a carcass extending in a toroidal shape between a left-and-right pair of bead portions, and has a belt layer and tread layer successively arranged onto the carcass at the outer part in the tire radial direction, the belt layer comprises at least one circumferential belt which consists of a plurality of corrugated or zigzag shaped steel cords extending along the tire circumferential direction, and at least the relations represented by the following expressions: -0.5 ¤ L1/ L2 ¤ 0.5, L2 ¤ 0 (where, in the case where the residual stress is a tensile stress, the stress is a + value while, in the case where the residual stress is a compressive stress, the stress is a - value) are satisfied, when the steel cords of the circumferential belt are taken out, at the inside and the outside of bent portions of the steel cords which are taken out, letting the residual stress at the inside of bent portions of the filament of a sheath portion be L1 and the residual stress at the outside of bent portions of the filament of the sheath portion be L2.