A pneumatic tire comprising: a tread portion having a tread surface and provided with a pair of circumferentially continuously extending axially outermost shoulder main grooves, and a pair of shoulder land portions axially outside the respective shoulder main grooves, each of the shoulder land portions is provided with a plurality of shoulder axial grooves extending from the shoulder main groove to the tread edge (Te), while inclining to a first-side in the tire circumferential direction, said a plurality of shoulder axial grooves each has a first-side groove edge, an opposite second-side groove edge, a first-side groove-sidewall extending radially inwardly from the first-side groove edge, and a second-side groove-sidewall extending radially inwardly from the second-side groove edge, and the shoulder axial groove has a part where the inclination angle β of the first-side groove-sidewall with respect to a normal line passing through the first-side groove edge perpendicularly to the tread surface is more than the inclination angle α of the second-side groove-sidewall with respect to a normal line passing through the second-side groove edge perpendicularly to the tread surface, wherein the inclination angles α and β are measured in the cross section of the shoulder axial groove perpendicular to the widthwise center line of the shoulder axial groove, characterized in that each of the shoulder axial grooves comprises an axially outer wide main part having a constant groove width, an axially inner narrower part having a constant groove width less than the width of the main part, and a transitional part connecting therebetween and having a groove width gradually decreasing toward the axially inside, the narrower part is such that the inclination angle α of the first-side groove-sidewall is equal to the inclination angle β of the second-side groove-sidewall, and the narrower part is positioned on the second-side of an extended line of the widthwise center line of the main part. a tread portion having a tread surface and provided with a pair of circumferentially continuously extending axially outermost shoulder main grooves, and a pair of shoulder land portions axially outside the respective shoulder main grooves, each of the shoulder land portions is provided with a plurality of shoulder axial grooves extending from the shoulder main groove to the tread edge (Te), while inclining to a first-side in the tire circumferential direction, said a plurality of shoulder axial grooves each has a first-side groove edge, an opposite second-side groove edge, a first-side groove-sidewall extending radially inwardly from the first-side groove edge, and a second-side groove-sidewall extending radially inwardly from the second-side groove edge, and the shoulder axial groove has a part where the inclination angle β of the first-side groove-sidewall with respect to a normal line passing through the first-side groove edge perpendicularly to the tread surface is more than the inclination angle α of the second-side groove-sidewall with respect to a normal line passing through the second-side groove edge perpendicularly to the tread surface, wherein the inclination angles α and β are measured in the cross section of the shoulder axial groove perpendicular to the widthwise center line of the shoulder axial groove, characterized in that each of the shoulder axial grooves comprises an axially outer wide main part having a constant groove width, an axially inner narrower part having a constant groove width less than the width of the main part, and a transitional part connecting therebetween and having a groove width gradually decreasing toward the axially inside, the narrower part is such that the inclination angle α of the first-side groove-sidewall is equal to the inclination angle β of the second-side groove-sidewall, and the narrower part is positioned on the second-side of an extended line of the widthwise center line of the main part.