A tire comprising: a tread that contacts a road surface; a side wall provided on an inner side of the tread in the tire radial direction (D R); and a buttress portion provided between the tread and the side wall, wherein a plurality of recessed portions are formed on the buttress portion along a tire circumferential direction (D C), each of the recessed portions has: a first outer edge that bulges inward in a tread widthwise direction (D T); and a second outer edge that continues to the first outer edge (110_) and bulges outward in the tread widthwise direction (D T) with respect to the first outer edge, and the distance (d) between a deepest portion of each respective recessed portion and a grounding end of the tread varies as proceeding along the tire circumferential direction (D C), wherein the first outer edge has an arc-like shape that is curved so as to bulge inward in the tread widthwise direction (D T), the second outer edge has an arc-like shape that is curved so as to bulge outward in the tread widthwise direction (D T) with respect to the first outer edge, and wherein the deepest portion is curved in side view of the tire, characterised in that the deepest portion comprises: a first curved portion that is curved so as to be closer to the first outer edge in the side view of the tire; and a second curved portion that continues to the first curved portion and is curved so as to be closer to the second outer edge in the side view of the tire. a tread that contacts a road surface; a side wall provided on an inner side of the tread in the tire radial direction (D R); and a buttress portion provided between the tread and the side wall, wherein a plurality of recessed portions are formed on the buttress portion along a tire circumferential direction (D C), each of the recessed portions has: a first outer edge that bulges inward in a tread widthwise direction (D T); and a second outer edge that continues to the first outer edge (110_) and bulges outward in the tread widthwise direction (D T) with respect to the first outer edge, and a first outer edge that bulges inward in a tread widthwise direction (D T); and a second outer edge that continues to the first outer edge (110_) and bulges outward in the tread widthwise direction (D T) with respect to the first outer edge, and the distance (d) between a deepest portion of each respective recessed portion and a grounding end of the tread varies as proceeding along the tire circumferential direction (D C), wherein the first outer edge has an arc-like shape that is curved so as to bulge inward in the tread widthwise direction (D T), the second outer edge has an arc-like shape that is curved so as to bulge outward in the tread widthwise direction (D T) with respect to the first outer edge, and wherein the deepest portion is curved in side view of the tire, characterised in that the deepest portion comprises: a first curved portion that is curved so as to be closer to the first outer edge in the side view of the tire; and a second curved portion that continues to the first curved portion and is curved so as to be closer to the second outer edge in the side view of the tire. a first curved portion that is curved so as to be closer to the first outer edge in the side view of the tire; and a second curved portion that continues to the first curved portion and is curved so as to be closer to the second outer edge in the side view of the tire.