A pneumatic tire comprising: a tread portion being provided with a plurality of inclined main grooves extending beyond a tire equator from one of a first tread edge (Tel) and a second tread edge and terminating without reaching the other one of the first tread edge and the second tread edge; each of the inclined main grooves comprising an outer portion and an inner portion; the outer portion extending from the first tread edge or the second tread edge without reaching the tire equator while increasing an angle (θ1) relative to an axial direction of the tire; and the inner portion being connected to the outer portion and traversing the tire equator at a smaller angle relative to the axial direction of the tire than the angle of the outer portion characterized in that the inner portion comprises a width increasing gradually toward the outer portion; the angle θ1 of the outer portion is in a range of from 15 to 65 degrees, wherein at the axially inner end of the outer portion, the angle θ7 of the outer portion is in a range of from 55 to 65 degrees relative to the axial direction of the tire and the angle θ2 of the inner portion relative to the axial direction of the tire is not less than 15 degrees but not more than 25 degree; an inner block disposed between a pair of circumferentially adjacent main grooves is provided with a lug groove that comprises a first end communicated with one of the inclined main grooves and a second end terminating within the inner block; the inclined main grooves comprise a plurality of first inclined main grooves extending from the first tread edge, and a plurality of second inclined main grooves extending from the second tread edge, the inner portions of the first inclined main grooves are communicated with the outer portions of the second inclined main grooves, the inner portions of the second inclined main grooves are communicated with the outer portions of the first inclined main grooves; and the lug groove comprises a first lug groove that is smoothly continuous to the inner portion of one of the second inclined main grooves through one of the first inclined main grooves, and a second lug groove that is smoothly continuous to the inner portion of one of the first inclined main grooves through one of the second inclined main grooves. a tread portion being provided with a plurality of inclined main grooves extending beyond a tire equator from one of a first tread edge (Tel) and a second tread edge and terminating without reaching the other one of the first tread edge and the second tread edge; each of the inclined main grooves comprising an outer portion and an inner portion; the outer portion extending from the first tread edge or the second tread edge without reaching the tire equator while increasing an angle (θ1) relative to an axial direction of the tire; and the inner portion being connected to the outer portion and traversing the tire equator at a smaller angle relative to the axial direction of the tire than the angle of the outer portion characterized in that the inner portion comprises a width increasing gradually toward the outer portion; the angle θ1 of the outer portion is in a range of from 15 to 65 degrees, wherein at the axially inner end of the outer portion, the angle θ7 of the outer portion is in a range of from 55 to 65 degrees relative to the axial direction of the tire and the angle θ2 of the inner portion relative to the axial direction of the tire is not less than 15 degrees but not more than 25 degree; an inner block disposed between a pair of circumferentially adjacent main grooves is provided with a lug groove that comprises a first end communicated with one of the inclined main grooves and a second end terminating within the inner block; the inclined main grooves comprise a plurality of first inclined main grooves extending from the first tread edge, and a plurality of second inclined main grooves extending from the second tread edge, the inner portions of the first inclined main grooves are communicated with the outer portions of the second inclined main grooves, the inner portions of the second inclined main grooves are communicated with the outer portions of the first inclined main grooves; and the lug groove comprises a first lug groove that is smoothly continuous to the inner portion of one of the second inclined main grooves through one of the first inclined main grooves, and a second lug groove that is smoothly continuous to the inner portion of one of the first inclined main grooves through one of the second inclined main grooves.