Pneumatic tire

A pneumatic tire (1) comprises a pair of bead portions (4) each having a bottom face (Sb) and an axially outer side face (Sw) which contact with a bead seat (Rb) and a flange (Rf) of a wheel rim, respectively, wherein the axially outer side face comprises: a radially outer part (Sw2) for contacting with a radially outermost curved portion (Rc) of the rim flange; and a radially inner part (Sw1) for contacting with a radially inner flat portion (Rv) of the rim flange. In a meridian section of the tire, the axially outer side face is provided with a profile such that the radially inner part is a substantially straight line, and the radially outer part is (A) a substantially straight line or (B) a convex line or (C) a curved concave line having a radius of curvature of not less than 300 mm, and the radially outer part extends radially outwards from the radially outer end of the radially inner part while inclining axially outwards.