A tire comprising a tread portion comprising at least one land region extending in a tire circumferential direction, wherein the land region is provided with a plurality of axial groove portions curved so as to protrude in one direction in the tire circumferential direction in a plan view, the axial groove portions include first axial groove portions and second axial groove portions having different degree of curvature from the first axial groove portions, the degree of curvature of each of the axial groove portions is defined by a radius of curvature of an arc passing through three points of a middle portion of an entire length of the axial groove portion, a first end portion and a second end portion each of which is a point distant on a side of the middle portion from corresponding one of ends of the axial groove portion by a distance L6 of 25% of the entire length of the axial groove portion, and a radius of curvature R1 of each of the first axial groove portions is larger than a radius of curvature R2 of each of the second axial groove portions, characterized in that the tread portion comprises a center main groove extending on a tire equator along the tire circumferential direction and two shoulder main grooves, wherein each shoulder main groove extends continuously along the tire circumferential direction between the center main groove and a corresponding one of two tread ground contact edges, a first land region of the land region is arranged on one side in the tire axial direction with respect to the center main groove and a second land region of the land region is arranged on the other side in the tire axial direction with respect to the center main groove in a way that the first land region and the second land region are adjacent to each other with the center main groove therebetween, wherein each of the first and second land regions (4A, 4B) is provided with a plurality of said axial groove portions including said first axial groove portions and said second axial groove portions, wherein both ends of each of the axial groove portions are connected to one of a center main groove and a corresponding adjacent one of the two shoulder main grooves, and wherein a protruding direction of the axial groove portions in the first land region and a protruding direction of the axial groove portions in the second land region are set in opposite directions in the tire circumferential direction. the land region is provided with a plurality of axial groove portions curved so as to protrude in one direction in the tire circumferential direction in a plan view, the axial groove portions include first axial groove portions and second axial groove portions having different degree of curvature from the first axial groove portions, the degree of curvature of each of the axial groove portions is defined by a radius of curvature of an arc passing through three points of a middle portion of an entire length of the axial groove portion, a first end portion and a second end portion each of which is a point distant on a side of the middle portion from corresponding one of ends of the axial groove portion by a distance L6 of 25% of the entire length of the axial groove portion, and a radius of curvature R1 of each of the first axial groove portions is larger than a radius of curvature R2 of each of the second axial groove portions, the tread portion comprises a center main groove extending on a tire equator along the tire circumferential direction and two shoulder main grooves, wherein each shoulder main groove extends continuously along the tire circumferential direction between the center main groove and a corresponding one of two tread ground contact edges, a first land region of the land region is arranged on one side in the tire axial direction with respect to the center main groove and a second land region of the land region is arranged on the other side in the tire axial direction with respect to the center main groove in a way that the first land region and the second land region are adjacent to each other with the center main groove therebetween, wherein each of the first and second land regions (4A, 4B) is provided with a plurality of said axial groove portions including said first axial groove portions and said second axial groove portions, wherein both ends of each of the axial groove portions are connected to one of a center main groove and a corresponding adjacent one of the two shoulder main grooves, and wherein a protruding direction of the axial groove portions in the first land region and a protruding direction of the axial groove portions in the second land region are set in opposite directions in the tire circumferential direction.