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 types of 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); wherein in a tire meridian cross-section, a profile line of a center land portion defined by the two center main grooves (14c, 14d) protrudes outward in the tire radial direction further than a standard profile line, the standard profile line being a curved line including all both end points (A1, A2, A3, A4) of the two center main grooves (14a, 14b) in the tire width direction, and 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 protrude outward in the tire radial direction further than the standard profile line, the shoulder land portions (Z1, Z2) being defined even further outward than the sub-center land portions (Y1, Y2), the profile lines (PL2, PL3) of the sub-center land portions (Y1, Y2) and the shoulder land portions (Z1, Z2) each including an outermost point (A2, A4) of the corresponding center main groove (14c, 14d) 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. 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 types of 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); wherein in a tire meridian cross-section, a profile line of a center land portion defined by the two center main grooves (14c, 14d) protrudes outward in the tire radial direction further than a standard profile line, the standard profile line being a curved line including all both end points (A1, A2, A3, A4) of the two center main grooves (14a, 14b) in the tire width direction, and 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 protrude outward in the tire radial direction further than the standard profile line, the shoulder land portions (Z1, Z2) being defined even further outward than the sub-center land portions (Y1, Y2), the profile lines (PL2, PL3) of the sub-center land portions (Y1, Y2) and the shoulder land portions (Z1, Z2) each including an outermost point (A2, A4) of the corresponding center main groove (14c, 14d) 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.