A tire for running on rough terrain comprising a tread portion having a specified tire rotational direction and provided with crown blocks, middle blocks arranged outside the crown blocks in a tire axial direction, and groove portions arranged between the crown blocks and the middle blocks, wherein each of the crown blocks includes a ground contacting surface, a first wall surface located on a heel side in the tire rotational direction, and a first edge located at the intersection of the ground contacting surface and the first wall surface, and each of the groove portions has a length (La) in the tire axial direction of 5% or more and 70% or less of a length (Lm) in the tire axial direction of each of the middle blocks characterized in that the first wall surface is inclined to a toe side in the tire rotational direction as it goes inward in a tire radial direction from the ground contacting surface, wherein in a plan view of each axial half of the tread portion with respect to a tire equator, the ground contacting surface of each of the crown blocks has a first point located on the most heel side in the tire rotational direction, a second point located on the most heel side in the tire rotational direction on the tire equator, and a third point located on the most toe side in the tire rotational direction on the tire equator, and in a pair of one of the crown blocks and one of the middle blocks immediately adjacent to each other in the tire axial direction, at least a part of the middle block is located between a first virtual line passing through the first point and the second point, and a second virtual line obtained by shifting the first virtual line in parallel onto the third point, wherein the first virtual line has an angle (θ1) of 45 degrees or more and 89 degrees or less with respect to the tire circumferential direction, and wherein 70% or more of an area (Am) of a ground contacting surface of each of the middle blocks is located between the first virtual line and the second virtual line. each of the crown blocks includes a ground contacting surface, a first wall surface located on a heel side in the tire rotational direction, and a first edge located at the intersection of the ground contacting surface and the first wall surface, and each of the groove portions has a length (La) in the tire axial direction of 5% or more and 70% or less of a length (Lm) in the tire axial direction of each of the middle blocks characterized in that the first wall surface is inclined to a toe side in the tire rotational direction as it goes inward in a tire radial direction from the ground contacting surface, wherein in a plan view of each axial half of the tread portion with respect to a tire equator, the ground contacting surface of each of the crown blocks has a first point located on the most heel side in the tire rotational direction, a second point located on the most heel side in the tire rotational direction on the tire equator, and a third point located on the most toe side in the tire rotational direction on the tire equator, and in a pair of one of the crown blocks and one of the middle blocks immediately adjacent to each other in the tire axial direction, at least a part of the middle block is located between a first virtual line passing through the first point and the second point, and a second virtual line obtained by shifting the first virtual line in parallel onto the third point, wherein the first virtual line has an angle (θ1) of 45 degrees or more and 89 degrees or less with respect to the tire circumferential direction, and wherein 70% or more of an area (Am) of a ground contacting surface of each of the middle blocks is located between the first virtual line and the second virtual line.