A pneumatic tire comprising: a pair of beads , wherein each bead includes a core , the core has a helical structure in which at least one non-stretchable wire extends almost in a circumferential direction, on a cross-section obtained by the core being cut at a plane perpendicular to the circumferential direction, three or more rows in each of which cross-sections of the wire are aligned almost in an axial direction, are layered in a radial direction, when, among the rows, a row disposed on an innermost side in the radial direction is a first row, and a row layered outward of the first row is a second row, the cross-sections of the wire in the first row and the cross-sections of the wire in the second row are staggered, a number N1 of the cross-sections of the wire in the first row is less, by one, than a number N2 of the cross-sections of the wire in the second row, positions of outer side ends of at least two of the rows are equal to each other in a direction in which each row extends, and the outer side ends are disposed outward of an outer side end of other of the rows, positions of inner side ends of at least two of the rows are equal to each other in the direction in which each row extends, and the inner side ends are disposed inward of an inner side end of other of the rows, and on a cross-section obtained by the tire being cut at a plane perpendicular to the circumferential direction, an outline of a heel surface of a bead portion of each bead has an arc (C) that projects toward an outside of the bead portion, characterized in that a radius (R) of curvature of the arc (C) is greater than or equal to 9 mm and not greater than 11 mm and on a cross-section obtained by the tire being cut at a plane perpendicular to the circumferential direction, an angle (θ) of a bottom surface of the bead portion relative to the axial direction is greater than or equal to 15° and not greater than 20°. a pair of beads , wherein each bead includes a core , the core has a helical structure in which at least one non-stretchable wire extends almost in a circumferential direction, on a cross-section obtained by the core being cut at a plane perpendicular to the circumferential direction, three or more rows in each of which cross-sections of the wire are aligned almost in an axial direction, are layered in a radial direction, when, among the rows, a row disposed on an innermost side in the radial direction is a first row, and a row layered outward of the first row is a second row, the cross-sections of the wire in the first row and the cross-sections of the wire in the second row are staggered, a number N1 of the cross-sections of the wire in the first row is less, by one, than a number N2 of the cross-sections of the wire in the second row, positions of outer side ends of at least two of the rows are equal to each other in a direction in which each row extends, and the outer side ends are disposed outward of an outer side end of other of the rows, positions of inner side ends of at least two of the rows are equal to each other in the direction in which each row extends, and the inner side ends are disposed inward of an inner side end of other of the rows, and on a cross-section obtained by the tire being cut at a plane perpendicular to the circumferential direction, an outline of a heel surface of a bead portion of each bead has an arc (C) that projects toward an outside of the bead portion, characterized in that a radius (R) of curvature of the arc (C) is greater than or equal to 9 mm and not greater than 11 mm and on a cross-section obtained by the tire being cut at a plane perpendicular to the circumferential direction, an angle (θ) of a bottom surface of the bead portion relative to the axial direction is greater than or equal to 15° and not greater than 20°. <EOS>