A pneumatic tire includes bead portions, each having a bead bottom surface. The bead bottom surface includes a toe-side portion extending axially outwardly from a bead toe at an angle α in a range of from 17 to 24 degrees with respect to the tire axial direction, a heel-side portion positioned axially outside the toe-side portion and extending axially outwardly at an angle β in a range of from 3 to 7 degrees with respect to the tire axial direction, and a heel-side arc portion smoothly connecting between the heel-side portion and a flange contacting surface with a radius of curvature (R) in a range of from 1.5 to 3.5 mm.