A pneumatic tire, comprising, on either side of a tire equatorial plane in a tire width direction, one center main groove (14a, 14b) extending in a tire circumferential direction, one shoulder main groove (14c, 14d) extending in the tire circumferential direction outward from the center main groove (14a, 14b) in the tire width direction, and five land portions (X, Y1, Y2, Z1, Z2) extending in the tire circumferential direction, the land portions (X, Y1, Y2, Z1, Z2) being defined by the four main grooves (14a..14d); in a tire meridian cross-section, a curved line including all four end points (A1, A2, A3, A4) of the two center main grooves (14a, 14b) in the tire width direction being defined as a standard profile line; a profile line of a center land portion defined by the two center main grooves (14a, 14b) protruding outward in the tire radial direction further than the standard profile line; profile lines (PL2, PL3) of sub-center land portions (Y1, Y2) and shoulder land portions (Z1, Z2) defined outward of the two center main grooves (14a, 14b) in the tire width direction protruding outward in the tire radial direction further than the standard profile line, the shoulder land portions (Z1, Z2) being defined further outward in the tire width direction than the sub-center land portions (Y1, Y2), characterized in that the profile lines (PL2, PL3) of the sub-center land portion (Y1, Y2) and the shoulder land portion (Z1, Z2) constitute one profile line ranging across the sub-center land portion (Y1, Y2) and the shoulder land portion (Z1, Z2); the profile lines (PL2, PL3) of the sub-center land portions (Y1, Y2) and the shoulder land portions (Z1, Z2) each including an outermost end point (A2, A4) of the corresponding center main groove (14a, 14b) in the tire width direction and both end points (A5..A8) of the corresponding shoulder main groove (14c, 14d) in the tire width direction, and being present on either side of the tire equatorial plane in the tire width direction; and a groove area ratio Go of a vehicle mounting outer side region and a groove area ratio Gi of a vehicle mounting inner side region satisfying the relationship Gi > Go. on either side of a tire equatorial plane in a tire width direction, one center main groove (14a, 14b) extending in a tire circumferential direction, one shoulder main groove (14c, 14d) extending in the tire circumferential direction outward from the center main groove (14a, 14b) in the tire width direction, and five land portions (X, Y1, Y2, Z1, Z2) extending in the tire circumferential direction, the land portions (X, Y1, Y2, Z1, Z2) being defined by the four main grooves (14a..14d); in a tire meridian cross-section, a curved line including all four end points (A1, A2, A3, A4) of the two center main grooves (14a, 14b) in the tire width direction being defined as a standard profile line; a profile line of a center land portion defined by the two center main grooves (14a, 14b) protruding outward in the tire radial direction further than the standard profile line; profile lines (PL2, PL3) of sub-center land portions (Y1, Y2) and shoulder land portions (Z1, Z2) defined outward of the two center main grooves (14a, 14b) in the tire width direction protruding outward in the tire radial direction further than the standard profile line, the shoulder land portions (Z1, Z2) being defined further outward in the tire width direction than the sub-center land portions (Y1, Y2), characterized in that the profile lines (PL2, PL3) of the sub-center land portion (Y1, Y2) and the shoulder land portion (Z1, Z2) constitute one profile line ranging across the sub-center land portion (Y1, Y2) and the shoulder land portion (Z1, Z2); the profile lines (PL2, PL3) of the sub-center land portions (Y1, Y2) and the shoulder land portions (Z1, Z2) each including an outermost end point (A2, A4) of the corresponding center main groove (14a, 14b) in the tire width direction and both end points (A5..A8) of the corresponding shoulder main groove (14c, 14d) in the tire width direction, and being present on either side of the tire equatorial plane in the tire width direction; and a groove area ratio Go of a vehicle mounting outer side region and a groove area ratio Gi of a vehicle mounting inner side region satisfying the relationship Gi > Go.