A pneumatic tire comprising: a tread portion, a pair of sidewall portions, a pair of axially spaced first and second bead portions (4A,4B), and a carcass extending between the first and second bead portions (4A,4B) through the tread portion and the sidewall portions, wherein the carcass is composed of a plurality of carcass plies including a first carcass ply (7A,12A,22A) having a ply length, and a second carcass ply (7B,12B,22B) having a ply length which is the same as the ply length of the first carcass ply (7A,12A,22A), and each of the first carcass ply (7A,12A,22A) and the second carcass ply (7B,12B,22B) is arranged asymmetrically with respect to a tire equator, wherein the first carcass ply (7A,12A,22A) is folded back radially outwardly in the first bead portion so as to have a folded-back portion having a first edge (7a,12a,22a), and the first carcass ply (7A,12A,22A) has a second edge (7b,12b,22b) positioned in the second bead portion and radially inside the first edge (7a,12a,22a), wherein the carcass further comprises a third carcass ply (12C,22C) which is, in the tread portion, located radially inside the first carcass ply (7A,12A,22A) and the second carcass ply (7B,12B,22B), wherein the third carcass ply (12C,22C) is folded back radially outwardly in the first bead portion so as to have a folded-back portion having a fifth edge (7e,12e,22e), and the third carcass ply (12C,22C) is folded back radially outwardly in the second bead portion so as to have a folded-back portion having a sixth edge (7f,12f,22f), characterized in that the fifth edge (7e,12e,22e) and the sixth edge (7f,12f,22f) are located at the same radial height. a tread portion, a pair of sidewall portions, a pair of axially spaced first and second bead portions (4A,4B), and a carcass extending between the first and second bead portions (4A,4B) through the tread portion and the sidewall portions, wherein the carcass is composed of a plurality of carcass plies including a first carcass ply (7A,12A,22A) having a ply length, and a second carcass ply (7B,12B,22B) having a ply length which is the same as the ply length of the first carcass ply (7A,12A,22A), and each of the first carcass ply (7A,12A,22A) and the second carcass ply (7B,12B,22B) is arranged asymmetrically with respect to a tire equator, wherein the first carcass ply (7A,12A,22A) is folded back radially outwardly in the first bead portion so as to have a folded-back portion having a first edge (7a,12a,22a), and the first carcass ply (7A,12A,22A) has a second edge (7b,12b,22b) positioned in the second bead portion and radially inside the first edge (7a,12a,22a), wherein the carcass further comprises a third carcass ply (12C,22C) which is, in the tread portion, located radially inside the first carcass ply (7A,12A,22A) and the second carcass ply (7B,12B,22B), wherein the third carcass ply (12C,22C) is folded back radially outwardly in the first bead portion so as to have a folded-back portion having a fifth edge (7e,12e,22e), and the third carcass ply (12C,22C) is folded back radially outwardly in the second bead portion so as to have a folded-back portion having a sixth edge (7f,12f,22f), characterized in that the fifth edge (7e,12e,22e) and the sixth edge (7f,12f,22f) are located at the same radial height.