A tire for running on rough terrain comprising a tread portion having a specified tire rotational direction (R) 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 (R), 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 (R) 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 (C), 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 (R), a second point located on the most heel side in the tire rotational direction (R) on the tire equator (C), and a third point located on the most toe side in the tire rotational direction (R) on the tire equator (C), 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 (M1) passing through the first point and the second point , and a second virtual line (M2) obtained by shifting the first virtual line (M1) in parallel onto the third point , wherein the first virtual line (M1) 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 (M1) and the second virtual line (M2). each of the crown blocks includes a ground contacting surface , a first wall surface located on a heel side in the tire rotational direction (R), 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 (R) 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 (C), 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 (R), a second point located on the most heel side in the tire rotational direction (R) on the tire equator (C), and a third point located on the most toe side in the tire rotational direction (R) on the tire equator (C), 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 (M1) passing through the first point and the second point , and a second virtual line (M2) obtained by shifting the first virtual line (M1) in parallel onto the third point , wherein the first virtual line (M1) 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 (M1) and the second virtual line (M2). <EOS>