A heavy duty pneumatic tire comprising: a pair of beads each including a core and an apex located outward of the core in a radial direction; a carcass extending on and between one bead and the other bead; a pair of chafers each located outward of the bead in an axial direction; and a tag assembly including an RFID tag and a covering rubber covering the RFID tag, wherein the apex includes an inner apex located on the core side and an outer apex located outward of the inner apex in the radial direction, a ratio of a complex elastic modulus (E*a) of the inner apex to a complex elastic modulus (E*b) of the outer apex is not less than 10 and not greater than 21, wherein said complex elastic modulus is measured using a viscoelasticity spectrometer according to the standards of JIS K6394, in which measurement a test piece obtained by pressurizing and heating a rubber composition for each component is used, under the following conditions: initial strain = 10%, amplitude = ±1 %, frequency = 10Hz, deformation mode = tension, measurement temperature = 70°C; the carcass includes at least one carcass ply, the carcass ply includes a ply body extending between one core and the other core and a pair of turned-up portions each connected to the ply body and turned up around the core from an inner side toward an outer side in the axial direction, an outer end of the inner apex is located outward of an end of the turned-up portion in the radial direction, the tag assembly is located outward of the outer apex in the axial direction, and the tire being characterized in that a distance in the radial direction from a bead base line to the RFID tag is not less than 120% and not greater than 145% of a distance in the radial direction from the bead base line to the end of the turned-up portion, and in that a ratio (TR/[TM1 + TM2]) of a thickness of the RFID tag to a total thickness (TM1 + TM2) of the covering rubber is not less than 0.34 and not greater than 0.58. a pair of beads each including a core and an apex located outward of the core in a radial direction; a carcass extending on and between one bead and the other bead; a pair of chafers each located outward of the bead in an axial direction; and a tag assembly including an RFID tag and a covering rubber covering the RFID tag, wherein the apex includes an inner apex located on the core side and an outer apex located outward of the inner apex in the radial direction, a ratio of a complex elastic modulus (E*a) of the inner apex to a complex elastic modulus (E*b) of the outer apex is not less than 10 and not greater than 21, wherein said complex elastic modulus is measured using a viscoelasticity spectrometer according to the standards of JIS K6394, in which measurement a test piece obtained by pressurizing and heating a rubber composition for each component is used, under the following conditions: initial strain = 10%, amplitude = ±1 %, frequency = 10Hz, deformation mode = tension, measurement temperature = 70°C; the carcass includes at least one carcass ply, the carcass ply includes a ply body extending between one core and the other core and a pair of turned-up portions each connected to the ply body and turned up around the core from an inner side toward an outer side in the axial direction, an outer end of the inner apex is located outward of an end of the turned-up portion in the radial direction, the tag assembly is located outward of the outer apex in the axial direction, and the tire being characterized in that a distance in the radial direction from a bead base line to the RFID tag is not less than 120% and not greater than 145% of a distance in the radial direction from the bead base line to the end of the turned-up portion, and in that a ratio (TR/[TM1 + TM2]) of a thickness of the RFID tag to a total thickness (TM1 + TM2) of the covering rubber is not less than 0.34 and not greater than 0.58.