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 (PW), the cross-sectional width specified position (PW) 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 (HS) in the radial direction from a bead base line (BBL) to the outer edge (Pg) of the outer surface of the rim guard relative to a distance (HW) in the radial direction from the bead base line (BBL) to the cross-sectional width specified position (PW) 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 (PW), the cross-sectional width specified position (PW) 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 (HS) in the radial direction from a bead base line (BBL) to the outer edge (Pg) of the outer surface of the rim guard relative to a distance (HW) in the radial direction from the bead base line (BBL) to the cross-sectional width specified position (PW) 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 (PW), the cross-sectional width specified position (PW) 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 (HS) in the radial direction from a bead base line (BBL) to the outer edge (Pg) of the outer surface of the rim guard relative to a distance (HW) in the radial direction from the bead base line (BBL) to the cross-sectional width specified position (PW) is not less than 1.01 and not greater than 1.3. <EOS>