To prevent the occurrence of a crack by strain caused in a buttress part 9.

In this pneumatic tire having a carcass 10 over a tread part 2, a shoulder part 3 and a sidewall part 4 and having a belt 8 on the outer peripheral side of the carcass 10 in the tread part 2, when a radius of curvature of section of a carcass 10A in the shoulder part 3 before filling air is R1 and a radius of curvature of section of the carcass 10A after filling air is R2, the relationship between both is set to R1≤R2.