A pneumatic tire comprising: a tread portion extending in a tire circumferential direction and having an annular shape; a pair of sidewall portions disposed on both sides of the tread portion; a pair of bead portions disposed inward of the sidewall portions in a tire radial direction, a plurality of longitudinal grooves extending in the tire circumferential direction; a plurality of lateral grooves extending in the tire lateral direction; and a plurality of blocks defined by the longitudinal grooves and the lateral grooves; side regions of the sidewall portions located outward of shoulder regions of the tread portion in a tire lateral direction being each provided with a pair of side blocks opposite each other across a side groove extending in the tire lateral direction, iteration elements each comprising the side groove and the pair of side blocks being arranged at an interval in the tire circumferential direction, a road contact surface of each of the side blocks having a recess/protrusion shape comprising a reference surface located on a side closer to the side groove and a step portion located on a side farther from the side groove and raised from the reference surface, the side groove comprising a raised bottom portion raised from a groove bottom and coupling the pair of side blocks among said plurality of blocks, an outermost block is provided on an outermost side in the tire lateral direction and a plurality of inner blocks inward in the tire lateral direction of said outermost block are arranged side by side along the tire lateral direction with respect to said outermost block, block groups, each including the outermost block and the plurality of inner blocks thus arranged, are repeatedly arranged in the tire circumferential direction with the lateral grooves interposed between the block groups, and the side blocks are disposed such that the side grooves are disposed on an extension line of the lateral grooves and such that the side blocks are outwardly adjacent to the outermost blocks in the tire lateral direction. a tread portion extending in a tire circumferential direction and having an annular shape; a pair of sidewall portions disposed on both sides of the tread portion; a pair of bead portions disposed inward of the sidewall portions in a tire radial direction, a plurality of longitudinal grooves extending in the tire circumferential direction; a plurality of lateral grooves extending in the tire lateral direction; and a plurality of blocks defined by the longitudinal grooves and the lateral grooves; side regions of the sidewall portions located outward of shoulder regions of the tread portion in a tire lateral direction being each provided with a pair of side blocks opposite each other across a side groove extending in the tire lateral direction, iteration elements each comprising the side groove and the pair of side blocks being arranged at an interval in the tire circumferential direction, a road contact surface of each of the side blocks having a recess/protrusion shape comprising a reference surface located on a side closer to the side groove and a step portion located on a side farther from the side groove and raised from the reference surface, the side groove comprising a raised bottom portion raised from a groove bottom and coupling the pair of side blocks among said plurality of blocks, an outermost block is provided on an outermost side in the tire lateral direction and a plurality of inner blocks inward in the tire lateral direction of said outermost block are arranged side by side along the tire lateral direction with respect to said outermost block, block groups, each including the outermost block and the plurality of inner blocks thus arranged, are repeatedly arranged in the tire circumferential direction with the lateral grooves interposed between the block groups, and the side blocks are disposed such that the side grooves are disposed on an extension line of the lateral grooves and such that the side blocks are outwardly adjacent to the outermost blocks in the tire lateral direction.