A heavy-duty pneumatic tire comprising: a tread portion; a pair of sidewall portions; a pair of bead portions each having a bead core therein, at least one of the bead cores comprising a substantially hexagonal cross sectional shape having a radially inner surface that is located radially inwardly and extends in the axial direction of the tire; a carcass comprising a carcass ply comprising a main portion extending between the bead cores and a pair of turn-up portions each wound up around the bead core from axially inside to the outside of the tire; a first reinforcing layer of a steel cord disposed in each bead portion, the first reinforcing layer extending in a U-shaped manner to surround the bead core; and a second reinforcing layer of an organic fiber cord disposed in each bead portion, at least a part of the second reinforcing layer extending in a radial direction of the tire at an axially outward location of the first reinforcing layer; the second reinforcing layer comprising an inner second ply being in contact with the first reinforcing layer and an outer second ply being in contact with the inner second ply; the outer second ply having an inner end positioned below the bead core; the inner second ply having an inner end located axially inward of the inner end of the outer second ply, the inner second ply having a substantially same length as the outer second ply in a tire cross-section, characterized in that an angle (θ2) between the inner surface of the bead core and a rim seat is zero plus/minus 3 degrees under both a standard condition and a loaded condition, wherein the standard condition is such that the tire is mounted on a standard wheel rim with a standard pressure and is loaded with no tire load, and wherein the loaded condition is such that the tire under the standard condition is grounded with a standard tire load at a camber angle of zero, the standard pressure being a standard pressure officially approved or recommended for the tire by standards organizations, and in that the inner end of the inner second ply and the inner end of the outer second ply are located axially inward of the radially inner surface of the bead core. a tread portion; a pair of sidewall portions; a pair of bead portions each having a bead core therein, at least one of the bead cores comprising a substantially hexagonal cross sectional shape having a radially inner surface that is located radially inwardly and extends in the axial direction of the tire; a carcass comprising a carcass ply comprising a main portion extending between the bead cores and a pair of turn-up portions each wound up around the bead core from axially inside to the outside of the tire; a first reinforcing layer of a steel cord disposed in each bead portion, the first reinforcing layer extending in a U-shaped manner to surround the bead core; and a second reinforcing layer of an organic fiber cord disposed in each bead portion, at least a part of the second reinforcing layer extending in a radial direction of the tire at an axially outward location of the first reinforcing layer; the second reinforcing layer comprising an inner second ply being in contact with the first reinforcing layer and an outer second ply being in contact with the inner second ply; the outer second ply having an inner end positioned below the bead core; the inner second ply having an inner end located axially inward of the inner end of the outer second ply, the inner second ply having a substantially same length as the outer second ply in a tire cross-section, characterized in that an angle (θ2) between the inner surface of the bead core and a rim seat is zero plus/minus 3 degrees under both a standard condition and a loaded condition, wherein the standard condition is such that the tire is mounted on a standard wheel rim with a standard pressure and is loaded with no tire load, and wherein the loaded condition is such that the tire under the standard condition is grounded with a standard tire load at a camber angle of zero, the standard pressure being a standard pressure officially approved or recommended for the tire by standards organizations, and in that the inner end of the inner second ply and the inner end of the outer second ply are located axially inward of the radially inner surface of the bead core.