A pneumatic tire where the positions of the groove deepest portions (33btm) in the circumferential grooves (33) vary in a predetermined cycle along the circumferential direction in a width direction of the tread within the circumferential grooves (33). Moreover, depth direction positions, where a groove bottom surface of the circumferential groove (33) contacts with each of perpendicular lines (perpendicular line P1, perpendicular line P2) which are perpendicular or approximately perpendicular to a tread surface and which pass respectively through edges (edge portion 11eg, edge portion 12eg) of the land portions on a side of each of the circumferential grooves of ribs, as well as angles which are formed by the perpendicular lines and a section line of a cross-section of the groove bottom surface in the width direction of the tread surface vary in the predetermined cycle along the circumferential direction. In the pneumatic tire, uneven wear of the tire caused by lateral force applied in a width direction of a tread is suppressed and wet performance is improved.