A heavy-duty tire comprising: a tread portion having a pair of tread edges (Te); a pair of bead portions each with a bead core therein; a pair of sidewall portions; a carcass extending between the pair of bead cores through the tread portion and the pair of sidewall portions; and a belt layer disposed outwardly in a tire radial direction of the carcass in the tread portion and comprising three or four belt plies (7A, 7B, 7C, 7D) of belt cords; characterized in that the tread portion is provided with a plurality of main grooves extending in a tire circumferential direction to form a crown land portion, a shoulder land portion including one of the pair of tread edges (Te) and a middle land portion disposed between the crown land portion and the shoulder land portion, in a tire cross-section of a 5% inflated state in which the tire is mounted on a standard wheel rim and is inflated to 5% of a standard pressure, the tread portion comprises a surface profile which comprises an inner arc portion having a radius of curvature with a center located in a tire equatorial plane and an outer arc portion having a radius of curvature smaller than the radius of curvature of the inner arc portion and intersecting the inner arc portion at an inflection point, the inflection point is located on the surface profile at the middle land portion, wherein a distance (Lp) in the tire axial direction from the tire equatorial plane to the inflection point is in a range of from 0.35 to 0.50 times a tread half-width (Wt) which is a distance in the tire axial direction from the tire equatorial plane to said one of the pair of tread edges (Te). a tread portion having a pair of tread edges (Te); a pair of bead portions each with a bead core therein; a pair of sidewall portions; a carcass extending between the pair of bead cores through the tread portion and the pair of sidewall portions; and a belt layer disposed outwardly in a tire radial direction of the carcass in the tread portion and comprising three or four belt plies (7A, 7B, 7C, 7D) of belt cords; the tread portion is provided with a plurality of main grooves extending in a tire circumferential direction to form a crown land portion, a shoulder land portion including one of the pair of tread edges (Te) and a middle land portion disposed between the crown land portion and the shoulder land portion, in a tire cross-section of a 5% inflated state in which the tire is mounted on a standard wheel rim and is inflated to 5% of a standard pressure, the tread portion comprises a surface profile which comprises an inner arc portion having a radius of curvature with a center located in a tire equatorial plane and an outer arc portion having a radius of curvature smaller than the radius of curvature of the inner arc portion and intersecting the inner arc portion at an inflection point, the inflection point is located on the surface profile at the middle land portion, wherein a distance (Lp) in the tire axial direction from the tire equatorial plane to the inflection point is in a range of from 0.35 to 0.50 times a tread half-width (Wt) which is a distance in the tire axial direction from the tire equatorial plane to said one of the pair of tread edges (Te).