A runflat tire having an improved runflat durability and including sidewall-reinforcing rubber layer 10 having a crescent-shaped cross section disposed axially inward of carcass 6 in sidewall portion 3, wherein the carcass 6 comprises at least one carcass ply 6A in which carcass cords made of an aramid fiber or a polyethylene naphthalate fiber are arranged at an angle of 70 to 90° with respect to the circumferential direction and are covered with a topping rubber.