Provided is a pneumatic tire in which basic performances needed for a side portion can be satisfied without compromising a light weight effect due to decrease in the gauge of the side portion.
Provided is a pneumatic tire which is composed of a pair of bead portions 11, a pair of side wall portions 12 extending from the pair of bead portions, and a tread portion 13 bridging both side wall portions and which comprises one or more carcasses 2 extending toroidally between the pair of bead portions. The carcass 2 is constituted of a treat which is an organic fiber cord coated with rubber; the occupancy rate of the organic fiber cord in the treat is 70% or higher; and the ratio of the cord diameter ϕ (mm) of the organic fiber cord as a dip treated cord to the minimum value D (mm) of the gauge in the thickness direction of the tire at an external region of the side wall portion in the tire radial direction from the maximum width portion of a tire when the tire is mounted to a rim satisfies the relationship represented by the expression below: