A pneumatic tire for use in rough terrain which is provided in the tread with central blocks, shoulder blocks and intermediate blocks; in the tread developed in a plane, the central blocks are arranged circumferentially of the tire at substantially constant pitch lengths P1, the intermediate blocks in each intermediate region are arranged circumferentially of the tire at substantially constant pitch lengths P2, the shoulder blocks in each shoulder region are arranged circumferentially of the tire at substantially constant pitch lengths P3; in a certain number (K) of circumferential positions, the central blocks are aligned with the intermediate blocks in the tire axial direction, the number (K) is in a range of from 6 to 32; these circumferential positions are provided circumferentially of the tire at regular intervals equal to the pitch length P1 multiplied by an integral number (n), the number (n) is in a range of from 3 to 8; and the pitch length P2 and pitch length P3 are equal to the pitch length P1 multiplied by n/(nnull1) or n/(nnull2).