A heavy load tire comprising: a plurality of circumferential grooves extending along a tire circumferential direction; a plurality of lateral grooves extending in a tire width direction and formed in a direction crossing the circumferential grooves, a groove width of the lateral grooves being 3mm to 30mm; a plurality of blocks partitioned by the circumferential grooves and the lateral grooves, and a shoulder groove that opens at an outermost position of a tread surface in the tire width direction and extends along the tire width direction, wherein on a whole surface of one end portion in the tire circumferential direction of a center block formed in a center area among the plurality of blocks, an inclined portion inclined inward in a tire radial direction toward the end portion is formed; the plurality of circumferential grooves include a first circumferential groove extending along the tire circumferential direction on a tire equator line, two second circumferential grooves (11a, 11b) adjacent to the first circumferential groove, and two third circumferential grooves (12a, 12b) formed outside the second circumferential grooves (11a, 11b) in the tire width direction, the plurality of lateral grooves include a first lateral groove communicating with the second circumferential groove, the third circumferential groove and the shoulder groove extending along the tire width direction via the third circumferential groove, and a second lateral groove communicating with the second circumferential groove and the third circumferential groove and not communicating with the shoulder groove, the plurality of blocks include an intermediate block partitioned by the second circumferential groove, the third circumferential groove, the first lateral groove, and the second lateral groove, characterized in that on a wall surface of a stepped end of the intermediate block, the stepped end being a portion that contacts a ground first when the heavy load tire rotates, a groove is formed inside in the tire width direction toward the tire radial direction. a plurality of circumferential grooves extending along a tire circumferential direction; a plurality of lateral grooves extending in a tire width direction and formed in a direction crossing the circumferential grooves, a groove width of the lateral grooves being 3mm to 30mm; a plurality of blocks partitioned by the circumferential grooves and the lateral grooves, and a shoulder groove that opens at an outermost position of a tread surface in the tire width direction and extends along the tire width direction, wherein on a whole surface of one end portion in the tire circumferential direction of a center block formed in a center area among the plurality of blocks, an inclined portion inclined inward in a tire radial direction toward the end portion is formed; the plurality of circumferential grooves include a first circumferential groove extending along the tire circumferential direction on a tire equator line, two second circumferential grooves (11a, 11b) adjacent to the first circumferential groove, and two third circumferential grooves (12a, 12b) formed outside the second circumferential grooves (11a, 11b) in the tire width direction, the plurality of lateral grooves include a first lateral groove communicating with the second circumferential groove, the third circumferential groove and the shoulder groove extending along the tire width direction via the third circumferential groove, and a second lateral groove communicating with the second circumferential groove and the third circumferential groove and not communicating with the shoulder groove, the plurality of blocks include an intermediate block partitioned by the second circumferential groove, the third circumferential groove, the first lateral groove, and the second lateral groove, characterized in that on a wall surface of a stepped end of the intermediate block, the stepped end being a portion that contacts a ground first when the heavy load tire rotates, a groove is formed inside in the tire width direction toward the tire radial direction.