A pneumatic tire comprising: a tread portion; a pair of sidewall portions; a pair of bead portions; a carcass extending between the bead portions; and an inner rubber extending between the bead portions, on the inside of the carcass, wherein the inner rubber comprises a first portion extending through the tread portion with a first thickness, and a second portion extending through the sidewall portions with a second thickness; the first thickness is more than the second thickness; the tread portion has a ground contacting surface between a first tread edge and a second tread edge; the sidewall portions respectively have outer surfaces extending radially inward from the first tread edge and the second tread edge, respectively; the ground contacting surface has a tire equator at the central position in the tire axial direction between the first tread edge and the second tread edge; and the outer surfaces have tire maximum width positions (Pm) which are the outermost positions in the tire axial direction, characterised in that in a meridian cross section of the tire under a normal state in which the tire is mounted on a regular rim, inflated to a normal internal pressure, and loaded with no load, when a first reference point is defined as an intersection of a bead base line with a straight line extending parallel to the tire radial direction through the tire equator (c); a second reference point is defined as an intersection of a straight line extending parallel to the tire axial direction through the tire equator (c) with a straight line extending parallel to the tire radial direction through the tire maximum width position (Pm); a reference line segment (Lb) is defined as a straight line extending between the first reference point and the second reference point; a shoulder reference point (Ps) is defined as an intersection of the reference line segment (Lb) with the ground contacting surface or the outer surface; and a shoulder line segment (Ls) is defined as a straight line connecting between the first reference point and the shoulder reference point (Ps), then the length of the shoulder line segment (Ls) is in a range from 85.9% to 89.3% of the length of the reference line segment (Lb). a tread portion; a pair of sidewall portions; a pair of bead portions; a carcass extending between the bead portions; and an inner rubber extending between the bead portions, on the inside of the carcass, wherein the inner rubber comprises a first portion extending through the tread portion with a first thickness, and a second portion extending through the sidewall portions with a second thickness; the first thickness is more than the second thickness; the tread portion has a ground contacting surface between a first tread edge and a second tread edge; the sidewall portions respectively have outer surfaces extending radially inward from the first tread edge and the second tread edge, respectively; the ground contacting surface has a tire equator at the central position in the tire axial direction between the first tread edge and the second tread edge; and the outer surfaces have tire maximum width positions (Pm) which are the outermost positions in the tire axial direction, characterised in that in a meridian cross section of the tire under a normal state in which the tire is mounted on a regular rim, inflated to a normal internal pressure, and loaded with no load, when a first reference point is defined as an intersection of a bead base line with a straight line extending parallel to the tire radial direction through the tire equator (c); a second reference point is defined as an intersection of a straight line extending parallel to the tire axial direction through the tire equator (c) with a straight line extending parallel to the tire radial direction through the tire maximum width position (Pm); a reference line segment (Lb) is defined as a straight line extending between the first reference point and the second reference point; a shoulder reference point (Ps) is defined as an intersection of the reference line segment (Lb) with the ground contacting surface or the outer surface; and a shoulder line segment (Ls) is defined as a straight line connecting between the first reference point and the shoulder reference point (Ps), then the length of the shoulder line segment (Ls) is in a range from 85.9% to 89.3% of the length of the reference line segment (Lb).