A run-flat tire comprising: a pair of beads ; a pair of sidewalls extending from each of the pair of beads to an outer side in a tire-radial direction; a tread disposed between the pair of sidewalls ; and a reinforcement rubber layer disposed at the sidewall ; wherein the bead includes a bead core and a bead filler extending to an outer side in the tire-radial direction of the bead core , wherein part of the reinforcement rubber layer is disposed at an inner side in a tire-width direction of the bead filler , wherein, in a tire-width direction cross-sectional view, a tire-radial direction length (Hb) from a tire-radial direction outside end of the bead filler until a tire-radial direction inside end of the reinforcement rubber layer is at least 70% of a tire-radial direction length (Ha) from the tire-radial direction outside end of the bead filler until the tire-radial direction inside end of the bead filler, and a variation range of a total thickness summing a thickness of the bead filler and wherein a length (H1) in a tire radial direction from a rim base line (BL) until a surface of the tread is at least three times a tire-radial direction length (H2) from the rim base line (BL) until the tire-radial direction outside end of the bead filler , the run-flat tire being characterised in that a thickness of the reinforcement rubber layer , within a range from the tire-radial direction outside end of the bead filler to the tire-radial direction inside end of the reinforcement rubber layer is within 10%, wherein the thickness is the member penetrating distance in a direction orthogonal to the tire-width direction inside surface of the reinforcement rubber layer , in the tire-width direction cross-sectional view. a pair of beads ; a pair of sidewalls extending from each of the pair of beads to an outer side in a tire-radial direction; a tread disposed between the pair of sidewalls ; and a reinforcement rubber layer disposed at the sidewall ; wherein the bead includes a bead core and a bead filler extending to an outer side in the tire-radial direction of the bead core , wherein part of the reinforcement rubber layer is disposed at an inner side in a tire-width direction of the bead filler , wherein, in a tire-width direction cross-sectional view, a tire-radial direction length (Hb) from a tire-radial direction outside end of the bead filler until a tire-radial direction inside end of the reinforcement rubber layer is at least 70% of a tire-radial direction length (Ha) from the tire-radial direction outside end of the bead filler until the tire-radial direction inside end of the bead filler, and a variation range of a total thickness summing a thickness of the bead filler and wherein a length (H1) in a tire radial direction from a rim base line (BL) until a surface of the tread is at least three times a tire-radial direction length (H2) from the rim base line (BL) until the tire-radial direction outside end of the bead filler , the run-flat tire being characterised in that a thickness of the reinforcement rubber layer , within a range from the tire-radial direction outside end of the bead filler to the tire-radial direction inside end of the reinforcement rubber layer is within 10%, wherein the thickness is the member penetrating distance in a direction orthogonal to the tire-width direction inside surface of the reinforcement rubber layer , in the tire-width direction cross-sectional view. <EOS>