Heavy duty pneumatic tire

A heavy duty pneumatic tire (1) is provided in the tread portion (2) with a zigzag crown main groove (3) and a pair of zigzag shoulder main grooves (4) so as to form two crown land portions (5A) therebetween. The crown land portion is divided by crown lateral grooves (6) into circumferentially arranged crown blocks (7). The crown lateral grooves in each crown land portion extend from alternate axially inside zigzag vertices (4i) of the shoulder main groove to zigzag vertices (3a,3b) of the crown main groove, while inclining with respect to the tire circumferential direction. The crown block is provided with a crown auxiliary groove (12) being narrower in width than the crown main groove and extending to one of the zigzag vertices of the crown main groove to which none of the crown lateral grooves are connected, from one of the inside zigzag vertices of the shoulder main groove, while inclining with respect to the tire axial direction.