A pneumatic tire, comprising: a carcass constituted of at least one ply and provided in a toroidal shape across a pair of bead cores of the tire so that the carcass is engaged with and held by the bead cores; a bead filler provided on the outer side in the tire radial direction of each bead core; and a rim guard provided on the outer side in the tire radial direction than a rim-tire separation point to protrude on the outer side in the tire width direction, the rim-tire separation point being a point at which the tire separates from a prescribed rim in a state where the tire is assembled with the prescribed rim and inflated at predetermined air pressure with no load thereon, and provided that "1CSH" represents a distance in the tire radial direction between the innermost end and the outermost end in the tire radial direction of the carcass, "positive direction" represents a direction on the outer side in the tire radial direction from the outermost end in the tire width direction of the rim guard as a reference point, and "negative direction" represents a direction on the inner side in the tire radial direction from the reference point, a distance in the tire radial direction measured from the outermost end in the tire width direction of the rim guard to the outermost end in the tire radial direction of a bead filler is in the range of - 0.2CSH to 0.05CSH, characterised in that a contour of a portion of the rim guard on the outer side in the tire radial direction than the outermost end in the tire width direction of the rim guard has radius of curvature in the range of 5 mm to 40 mm in a cross section in the tire width direction of the tire. a carcass constituted of at least one ply and provided in a toroidal shape across a pair of bead cores of the tire so that the carcass is engaged with and held by the bead cores; a bead filler provided on the outer side in the tire radial direction of each bead core; and a rim guard provided on the outer side in the tire radial direction than a rim-tire separation point to protrude on the outer side in the tire width direction, the rim-tire separation point being a point at which the tire separates from a prescribed rim in a state where the tire is assembled with the prescribed rim and inflated at predetermined air pressure with no load thereon, and provided that "1CSH" represents a distance in the tire radial direction between the innermost end and the outermost end in the tire radial direction of the carcass, "positive direction" represents a direction on the outer side in the tire radial direction from the outermost end in the tire width direction of the rim guard as a reference point, and "negative direction" represents a direction on the inner side in the tire radial direction from the reference point, a distance in the tire radial direction measured from the outermost end in the tire width direction of the rim guard to the outermost end in the tire radial direction of a bead filler is in the range of - 0.2CSH to 0.05CSH, characterised in that a contour of a portion of the rim guard on the outer side in the tire radial direction than the outermost end in the tire width direction of the rim guard has radius of curvature in the range of 5 mm to 40 mm in a cross section in the tire width direction of the tire.