A method for manufacturing a heavy duty pneumatic tire including a tread that comes into contact with a road surface and a belt located radially inward of the tread , using a vulcanizing apparatus including a mold (M) for molding the tire , the method comprising: a step of preparing an uncured tire including the tread and the belt ; a step of putting the uncured tire into the mold (M); and a step of expanding the uncured tire in diameter and pressurizing and heating the uncured tire in the mold (M), characterized in that the belt includes a plurality of layers stacked in a radial direction, and, among the plurality of layers, a layer having a largest width in an axial direction is a first reference layer (B1), a layer stacked at an outer side of the first reference layer is a second reference layer (B2), and a layer located at an innermost side in the radial direction is a third reference layer (B3), a ratio of a center stretch Sc, at a center portion of the third reference layer (B3), indicated by the following formula to a shoulder stretch Ss, at an end portion of the third reference layer, indicated by the following formula is not less than 1 and not greater than 3, and the shoulder stretch Ss is not less than 1%, (shoulder stretch Ss) 100 × Rsa − Rsb / Rsb (center stretch Sc) 100 × Rca − Rcb / Rcb where Rsa is an inner diameter of the end portion of the third reference layer (B3) in the tire , Rsb is an inner diameter of the end portion of the third reference layer (B3) in the uncured tire , Rca is an inner diameter of the center portion of the third reference layer (B3) in the tire , and Rcb is an inner diameter of the center portion of the third reference layer (B3) in the uncured tire , and Rsa and Rca are measured in a state where the internal pressure of the tire is adjusted to 10% of the normal internal pressure, and no load is applied to the tire . a step of preparing an uncured tire including the tread and the belt ; a step of putting the uncured tire into the mold (M); and a step of expanding the uncured tire in diameter and pressurizing and heating the uncured tire in the mold (M), characterized in that the belt includes a plurality of layers stacked in a radial direction, and, among the plurality of layers, a layer having a largest width in an axial direction is a first reference layer (B1), a layer stacked at an outer side of the first reference layer is a second reference layer (B2), and a layer located at an innermost side in the radial direction is a third reference layer (B3), a ratio of a center stretch Sc, at a center portion of the third reference layer (B3), indicated by the following formula to a shoulder stretch Ss, at an end portion of the third reference layer, indicated by the following formula is not less than 1 and not greater than 3, and the shoulder stretch Ss is not less than 1%, (shoulder stretch Ss) 100 × Rsa − Rsb / Rsb (center stretch Sc) 100 × Rca − Rcb / Rcb where Rsa is an inner diameter of the end portion of the third reference layer (B3) in the tire , Rsb is an inner diameter of the end portion of the third reference layer (B3) in the uncured tire , Rca is an inner diameter of the center portion of the third reference layer (B3) in the tire , and Rcb is an inner diameter of the center portion of the third reference layer (B3) in the uncured tire , and Rsa and Rca are measured in a state where the internal pressure of the tire is adjusted to 10% of the normal internal pressure, and no load is applied to the tire . <EOS>