Run-flat tire

A run-flat tire comprises:a carcass (6) comprising a carcass ply (6A) of cords extending between bead portions and turned up around a bead core in each bead portion from the inside to outside of the tire so as to form a pair of turnup portions (6b) and a main portion (6a) therebetween;a belt (7) disposed radially outside the carcass (6) in the tread portion; anda reinforcing rubber layer (11) comprisinga pair of side parts (12) each provided between the main portion (6a) and the turnup portion (6b) and extending from the bead core (5) to the proximity of axially outer edge (7E) of the belt (7), anda center part (13) disposed between the carcass (6) and the belt (7) and connected to the side parts (12) of both side.