To provide a pneumatic tire by which rolling resistance is reduced while cracking resistance in side wall portions is maintained. A foam rubber layer 6 extending in a tire radial direction is disposed in at least a portion of the side wall portion 3. Heat conductivity at 23° C. of the foam rubber layer 6 is from 0.05 to 0.20 W/mK, a tan δ at 60° C. is not more than 0.17, and an expansion ratio Q is from 50 to 160%.