A pneumatic tire comprises a tread portion provided with a center main groove on the tire equator and a shoulder main groove on each side of the center main groove. The center main groove and the shoulder main groove extend zigzag and continuously in the tire circumferential direction so that a crown land portion defined between the center main groove and the shoulder main groove has an axial width alternately increasing and decreasing along the tire circumferential direction. The crown land portion is provided with a shallow crown circumferential groove extending zigzag and continuously in the tire circumferential direction, and crown sipes extending from the center main groove to the shoulder main groove across the shallow crown circumferential groove. Zigzag apexes of the shallow crown circumferential groove are respectively positioned between the crown sipes.