A bead portion 4 of a pneumatic tire 1 includes a vertical rising surface portion Sw1 which is connected to a bead base surface Sb through an arc bead heel surface Sh, and a straight or convex arc flange receiving surface portion Sw2 which is diagonally extending from the rising surface portion Sw1 radially outward and axially outward of the tire. In a normal internal pressure in which no load is applied, the flange receiving surface portion Sw2 is not in contact with a flange surface Rf, and in a load state in which 50% or more of normal load is applied, the flange receiving surface portion Sw2 comes into contact with the flange surface Rf.