A run-flat radial tire includes: a carcass spanning between a pair of bead portions; a side reinforcement layer disposed at tire side portions; and a reinforcement cord layer that is disposed at a tire radial direction outside of the carcass, that comprises cord inclined to a tire circumferential direction at an angle of inclination of from 60 degrees to 90 degrees, and that is disposed such that, when the side reinforcement layer is projected along a tire radial direction, the reinforcement cord layer overlaps with a projected length of the side reinforcement layer in a region of 6% of a tread width of a tread portion, or greater.