A run-flat tire comprising: a pair of bead portions that are each embedded with a bead core; side wall portions that are respectively connected to tire radial direction outer sides of the bead portions; a carcass that spans between the pair of bead portions and that includes a main body portion positioned between the bead cores, and a folded-back portion folded back from an inner side toward an outer side about the bead core; a tread that is provided at the tire radial direction outer side of the main body portion; a side reinforcing layer that is disposed at a tire width direction inner side of the main body portion and that is configured so as to respectively gradually decrease in thickness (Gf) toward a crown portion of the carcass and toward the bead portion; a bead filler provided between the bead core, and the main body portion and the folded-back portion of the carcass; and a side layer that is disposed in the side wall portion at the tire outer side of the main body portion, that configures a tire outer face, and that satisfies Gs/Gt6 ≤ 0.35, wherein Gs is a thickness of the side layer and Gt6 is an overall thickness of the side wall portion at a position of a maximum width CW of the main body portion in the tire width direction, characterized in that: Gf5/Gt5 ≤ 0.1, where Gf5 is the thickness of the bead filler, and Gt5 is the overall thickness of the side wall portion, at a position 0.5SH toward the tire radial direction outer side from the rim baseline BL; and in that: 0.2≤Gf4/Gt4≤0.3 is satisfied, where SH is a tire cross-section height, Gf4 is the thickness of the bead filler, and Gt4 is the overall thickness of the side wall portion, at a position 0.4SH toward the tire radial direction outer side from the rim baseline BL, wherein the respective thicknesses are measured along a direction normal to the outer face of the main body portion in cross-section along the tire width direction of the carcass. a pair of bead portions that are each embedded with a bead core; side wall portions that are respectively connected to tire radial direction outer sides of the bead portions; a carcass that spans between the pair of bead portions and that includes a main body portion positioned between the bead cores, and a folded-back portion folded back from an inner side toward an outer side about the bead core; a tread that is provided at the tire radial direction outer side of the main body portion; a side reinforcing layer that is disposed at a tire width direction inner side of the main body portion and that is configured so as to respectively gradually decrease in thickness (Gf) toward a crown portion of the carcass and toward the bead portion; a bead filler provided between the bead core, and the main body portion and the folded-back portion of the carcass; and a side layer that is disposed in the side wall portion at the tire outer side of the main body portion, that configures a tire outer face, and that satisfies Gs/Gt6 ≤ 0.35, wherein Gs is a thickness of the side layer and Gt6 is an overall thickness of the side wall portion at a position of a maximum width CW of the main body portion in the tire width direction, characterized in that: Gf5/Gt5 ≤ 0.1, where Gf5 is the thickness of the bead filler, and Gt5 is the overall thickness of the side wall portion, at a position 0.5SH toward the tire radial direction outer side from the rim baseline BL; and in that: 0.2≤Gf4/Gt4≤0.3 is satisfied, where SH is a tire cross-section height, Gf4 is the thickness of the bead filler, and Gt4 is the overall thickness of the side wall portion, at a position 0.4SH toward the tire radial direction outer side from the rim baseline BL, wherein the respective thicknesses are measured along a direction normal to the outer face of the main body portion in cross-section along the tire width direction of the carcass. Gf5/Gt5 ≤ 0.1, where Gf5 is the thickness of the bead filler, and Gt5 is the overall thickness of the side wall portion, at a position 0.5SH toward the tire radial direction outer side from the rim baseline BL; and in that: 0.2≤Gf4/Gt4≤0.3 is satisfied, where SH is a tire cross-section height, Gf4 is the thickness of the bead filler, and Gt4 is the overall thickness of the side wall portion, at a position 0.4SH toward the tire radial direction outer side from the rim baseline BL, wherein the respective thicknesses are measured along a direction normal to the outer face of the main body portion in cross-section along the tire width direction of the carcass. 0.2≤Gf4/Gt4≤0.3 is satisfied, where SH is a tire cross-section height, Gf4 is the thickness of the bead filler, and Gt4 is the overall thickness of the side wall portion, at a position 0.4SH toward the tire radial direction outer side from the rim baseline BL, wherein the respective thicknesses are measured along a direction normal to the outer face of the main body portion in cross-section along the tire width direction of the carcass.