The pneumatic tire includes a tread portion having lug grooves, and side portions which are contiguously formed with the tread portion. Projections which differ in at least one of a shape and a size are arranged on a side portion in a plurality of rows in a tire radial direction. Opening positions of small lug grooves on both sides of the tread portion are made to agree with a straight line which passes the projection and extends in the tire radial direction.