Pneumatic tire

A pneumatic tire comprises a tread portion provided with a shoulder main groove (3), shoulder lateral grooves (10) extending from the shoulder main groove (3) toward axially outwardly, the shoulder main groove (3) extending in a zigzag manner comprising linear portions (14) and curved portions (15) which are arranged alternately in a circumferential direction of the tire, each linear portion (14) inclined with respect to the circumferential direction of the tire, each curved portion (15) having a radius of curvature of from 12-80mm, the curved portion (15) protruding toward axially outwardly of the tire, the shoulder main groove (3) having a pair of groove edges (3x) and a circumferential space therebetween which straightly extends along the circumferential direction of the tire without coming into contact with both groove edges (3x) and the circumferential space with an axial width of from 0.2 to 0.7 times an axial groove width of the shoulder main groove (3).