A pneumatic tire comprising: a tread; and a pair of side portions each located radially inward of an edge of the tread, each side portion including a main body and a rim guard projecting axially outward from an external surface of the main body, wherein the rim guard has a top, an inner surface located radially inward of the top, and an outer surface located radially outward of the top, a contour of the inner surface is represented by a circular arc having a center at an outer side of the tire, and the circular arc has a radius (Ru) of not less than 20 mm and not greater than 30 mm, a contour of the outer surface is represented by a circular arc having a center at the outer side of the tire, and the circular arc has a radius (Rs) of not less than 100 mm and not greater than 500 mm, characterized in that: in a radial direction, the outer edge (Pg) of the outer surface is located outward of a cross-sectional width specified position, the cross-sectional width specified position being an axially outer end of the tire, obtained on the assumption that the rim guard is not provided, where a cross-sectional width of the tire is specified, wherein a ratio of a distance in the radial direction from a bead base line to the outer edge (Pg) of the outer surface of the rim guard relative to a distance in the radial direction from the bead base line to the cross-sectional width specified position is not less than 1.01 and not greater than 1.3. a tread; and a pair of side portions each located radially inward of an edge of the tread, each side portion including a main body and a rim guard projecting axially outward from an external surface of the main body, wherein the rim guard has a top, an inner surface located radially inward of the top, and an outer surface located radially outward of the top, a contour of the inner surface is represented by a circular arc having a center at an outer side of the tire, and the circular arc has a radius (Ru) of not less than 20 mm and not greater than 30 mm, a contour of the outer surface is represented by a circular arc having a center at the outer side of the tire, and the circular arc has a radius (Rs) of not less than 100 mm and not greater than 500 mm, characterized in that: in a radial direction, the outer edge (Pg) of the outer surface is located outward of a cross-sectional width specified position, the cross-sectional width specified position being an axially outer end of the tire, obtained on the assumption that the rim guard is not provided, where a cross-sectional width of the tire is specified, wherein a ratio of a distance in the radial direction from a bead base line to the outer edge (Pg) of the outer surface of the rim guard relative to a distance in the radial direction from the bead base line to the cross-sectional width specified position is not less than 1.01 and not greater than 1.3. in a radial direction, the outer edge (Pg) of the outer surface is located outward of a cross-sectional width specified position, the cross-sectional width specified position being an axially outer end of the tire, obtained on the assumption that the rim guard is not provided, where a cross-sectional width of the tire is specified, wherein a ratio of a distance in the radial direction from a bead base line to the outer edge (Pg) of the outer surface of the rim guard relative to a distance in the radial direction from the bead base line to the cross-sectional width specified position is not less than 1.01 and not greater than 1.3.