A tire comprising; a tread portion comprising a shoulder main groove extending continuously in a tire circumferential direction on a side of a tread edge (Te); the shoulder main groove comprising an inner groove wall on an inner side in a tire axial direction and an outer groove wall on an outer side in the tire axial direction; the inner groove wall having an angle θ1 with respect to a tread normal line of the inner groove wall in a cross section of the shoulder main groove periodically increasing and decreasing in the tire circumferential direction so that the inner groove wall comprises concave wall portions and convex wall portions arranged alternately in the tire circumferential direction; the concave wall portions of the inner groove wall being concave in a direction away from a groove center of the shoulder main groove; the convex wall portions of the inner groove wall being convex in a direction approaching the groove center of the shoulder main groove; the outer groove wall having an angle θ2 with respect to a tread normal line of the outer groove wall in the cross section of the shoulder main groove periodically increasing and decreasing in the tire circumferential direction so that the outer groove wall comprises convex wall portions and concave wall portions arranged alternately in the tire circumferential direction; the convex wall portions of the outer groove wall facing the concave wall portions of the inner groove wall and convex in a direction approaching the groove center of the shoulder main groove; and the concave wall portions of the outer groove wall facing the convex wall portions of the inner groove wall and concave in a direction away from the groove center of the shoulder main groove; characterized in that the angle θ2 of the outer groove wall is larger than the angle θ1 of the inner groove wall in any cross section of the shoulder main groove. a tread portion comprising a shoulder main groove extending continuously in a tire circumferential direction on a side of a tread edge (Te); the shoulder main groove comprising an inner groove wall on an inner side in a tire axial direction and an outer groove wall on an outer side in the tire axial direction; the inner groove wall having an angle θ1 with respect to a tread normal line of the inner groove wall in a cross section of the shoulder main groove periodically increasing and decreasing in the tire circumferential direction so that the inner groove wall comprises concave wall portions and convex wall portions arranged alternately in the tire circumferential direction; the concave wall portions of the inner groove wall being concave in a direction away from a groove center of the shoulder main groove; the convex wall portions of the inner groove wall being convex in a direction approaching the groove center of the shoulder main groove; the outer groove wall having an angle θ2 with respect to a tread normal line of the outer groove wall in the cross section of the shoulder main groove periodically increasing and decreasing in the tire circumferential direction so that the outer groove wall comprises convex wall portions and concave wall portions arranged alternately in the tire circumferential direction; the convex wall portions of the outer groove wall facing the concave wall portions of the inner groove wall and convex in a direction approaching the groove center of the shoulder main groove; and the concave wall portions of the outer groove wall facing the convex wall portions of the inner groove wall and concave in a direction away from the groove center of the shoulder main groove; characterized in that the angle θ2 of the outer groove wall is larger than the angle θ1 of the inner groove wall in any cross section of the shoulder main groove.