A carcass 7 includes first and second carcass plies 9 and 10. The first carcass ply 9 has a body portion 9A extending from a tread portion 2 to a bead core 5 through a sidewall portion 3, and a wound up portion 9B which is folded back from inside to outside around the bead core 5. The body portion 9A is provided with the wound up portion 9B. The second carcass ply 10 includes an inserting portion 10B2 which passes between a wound up portion 9B and the body portion 9A of the first carcass ply 9 from the tread portion 2 through the sidewall portion 3. The inserting portion 10B2 enters a bead apex 6 and is terminated therein.