A pneumatic tire comprises a tread portion, a pair of sidewall portions, a
pair of bead portions, a bead core disposed in each bead portion, a
carcass comprising a ply of carcass cords extending between the bead
portions through the tread portion and sidewall portions and turned up
around the bead core in each bead portion, and an inner liner made of
air-impermeable rubber extending on the tire cavity side of the carcass
from one of the bead portions to the other. The radially inner end of the
inner liner is located radially inside the radially innermost end of the
carcass. In a radial region between the radially innermost end of the
carcass and the radially outermost end of the bead core, the thickness of
the inner liner is not less than 0.15 time but not more than 4.0 times
the cross section diameter of the carcass cord.