To maintain horizontal grip performance on an off-road and reduce chipping abrasion.

In a pneumatic tire 1, a mounting direction to a vehicle M is specified. Inclined grooves 3 extending toward the side of a grounding edge Ti inside of the vehicle from a grounding edge To outside of the vehicle and a block line BL including a plurality of inclined blocks B1 which are divided by the inclined grooves 3 and joining grooves 4 joining between the inclined grooves 3 are formed in a tread portion 2. At least one of the inclined blocks B1 includes a leading side rubber portion 15 and a trailing side rubber portion 16. The 300% modulus M1 of the leading side rubber portion 15 is greater than the 300% modulus M2 of the trailing side rubber portion 16.