A tire comprising: a tread portion having a grounding surface contacting with a road surface; a plurality of lateral grooves (40A, 40B) which are depressed inside of a tire radial direction from the grounding surface, and which are formed along a tread widthwise direction (tw); a plurality of circumferential grooves (20A, 20B, 20C) which communicate with the plurality of lateral grooves (40A, 40B), which is depressed inside of a tire radial direction from the grounding surface, and which is formed along a tire circumferential direction; and a plurality of land blocks (100, 110, 120, 130) which are partitioned by the lateral grooves (40A, 40B) and the circumferential grooves (20A, 20B, 20C), wherein the plurality of lateral grooves (40A, 40B), the plurality of circumferential grooves (20A, 20B, 20C), and the plurality of land blocks (100, 110, 120, 130) are formed at the tread portion, the lateral grooves (40A, 40B) cross the circumferential grooves (20A, 20B, 20C) in a range of the tread widthwise direction (tw) in which the lateral grooves (40A, 40B) are formed, the land block (100, 110, 120, 130) comprising: a lateral side face portion forming a groove wall of the lateral grooves (40A, 40B); and a circumferential side face portion forming a groove wall of the circumferential grooves (20A, 20B, 20C), wherein a protrusion protruding in the tire circumferential direction (tc) from the lateral side face portion and extending in a tire radial direction is formed in a region of one side of the tread widthwise direction (tw) of the land blocks (100, 110, 120, 130) more significantly than a central part of the lateral side face portion the tire further comprising: a bead portion, a side wall portion communicating with the bead portion, the tread portion contacting with the road surface, and a buttress portion extending from a tread end part located outside of the widthwise direction of the tread portion toward inside of the tire radial direction leading up to a groove bottom of the lateral grooves (40A, 40B), wherein a pneumatic air supply mechanism to supply pneumatic air to the lateral grooves (40A, 40B) is formed in a range from the tread portion leading up to the buttress portion, characterised in that: a buttress protrusion protruding in the tread widthwise direction (tw) is formed at the buttress portion. a tread portion having a grounding surface contacting with a road surface; a plurality of lateral grooves (40A, 40B) which are depressed inside of a tire radial direction from the grounding surface, and which are formed along a tread widthwise direction (tw); a plurality of circumferential grooves (20A, 20B, 20C) which communicate with the plurality of lateral grooves (40A, 40B), which is depressed inside of a tire radial direction from the grounding surface, and which is formed along a tire circumferential direction; and a plurality of land blocks (100, 110, 120, 130) which are partitioned by the lateral grooves (40A, 40B) and the circumferential grooves (20A, 20B, 20C), wherein the plurality of lateral grooves (40A, 40B), the plurality of circumferential grooves (20A, 20B, 20C), and the plurality of land blocks (100, 110, 120, 130) are formed at the tread portion, the lateral grooves (40A, 40B) cross the circumferential grooves (20A, 20B, 20C) in a range of the tread widthwise direction (tw) in which the lateral grooves (40A, 40B) are formed, the land block (100, 110, 120, 130) comprising: a lateral side face portion forming a groove wall of the lateral grooves (40A, 40B); and a circumferential side face portion forming a groove wall of the circumferential grooves (20A, 20B, 20C), wherein a lateral side face portion forming a groove wall of the lateral grooves (40A, 40B); and a circumferential side face portion forming a groove wall of the circumferential grooves (20A, 20B, 20C), wherein a protrusion protruding in the tire circumferential direction (tc) from the lateral side face portion and extending in a tire radial direction is formed in a region of one side of the tread widthwise direction (tw) of the land blocks (100, 110, 120, 130) more significantly than a central part of the lateral side face portion the tire further comprising: a bead portion, a side wall portion communicating with the bead portion, the tread portion contacting with the road surface, and a buttress portion extending from a tread end part located outside of the widthwise direction of the tread portion toward inside of the tire radial direction leading up to a groove bottom of the lateral grooves (40A, 40B), wherein a pneumatic air supply mechanism to supply pneumatic air to the lateral grooves (40A, 40B) is formed in a range from the tread portion leading up to the buttress portion, characterised in that: a buttress protrusion protruding in the tread widthwise direction (tw) is formed at the buttress portion. a bead portion, a side wall portion communicating with the bead portion, the tread portion contacting with the road surface, and a buttress portion extending from a tread end part located outside of the widthwise direction of the tread portion toward inside of the tire radial direction leading up to a groove bottom of the lateral grooves (40A, 40B), wherein a pneumatic air supply mechanism to supply pneumatic air to the lateral grooves (40A, 40B) is formed in a range from the tread portion leading up to the buttress portion, characterised in that: a buttress protrusion protruding in the tread widthwise direction (tw) is formed at the buttress portion.