RUN FLAT TYRE

Provided is a run-flat tire in which a side-reinforcing rubber is arranged on the inside of the carcass in the tire width direction on both sidewall portions. The carcass plies include cords made of a material having a heat shrinkage rate of 2% to 8% at 177°C, and the run-flat tire further includes a reinforcing cord layer which includes cords made of a material having a heat shrinkage rate of less than 2% at 177°C, the reinforcing cord layer being arranged on the outside of the side-reinforcing rubber in the tire width direction on both sidewall portions.