A pneumatic tire, comprising: a plurality of first inclined main grooves that extend while inclining to one side with respect to a tire circumferential direction, open to a tire equatorial plane and a tire ground contact edge on the one side and extend beyond the tire equatorial plane; a plurality of second inclined main grooves that extend while inclining to an other side in the tire circumferential direction, open to the tire equatorial plane and a tire ground contact edge on the other side and extend beyond the tire equatorial plane; a plurality of first land portions that are defined by a pair of the first inclined main grooves adjacent to each other and by one of the second inclined main grooves, the plurality of first land portions extending from the tire equatorial plane to the tire ground contact edge on the one side; and a plurality of second land portions that are defined by a pair of the second inclined main grooves adjacent to each other and by one of the first inclined main grooves, the plurality of second land portions extending from the tire equatorial plane to the tire ground contact edge on the other side, the plurality of first land portions being arrayed adjacent to each other in the tire circumferential direction, the plurality of second land portions being arrayed adjacent to each other in the tire circumferential direction, the first land portions and the second land portions being arrayed in a staggered manner along the tire equatorial plane, the first land portions and the second land portions each comprising a plurality of through grooves (41, 42) that extend through the land portion (3A, 3B) and open to the pair of inclined main grooves (2A, 2B), and a plurality of blocks (51, 52, 53) defined by the through grooves (41, 42), the blocks comprising an innermost center block that is defined as a block closest to the tire equatorial plane, and the innermost center block comprising an edge portion that comprises a notch portion opening to a position where an inclined main groove (2A, 2B) on one side connects sideways in a Y-shape to an inclined main groove (2B, 2A) on the other side, and is disposed on an extension line of a groove center line of the inclined main groove (2A,2B) on the one side at this connection portion of the inclined main grooves (2A, 2B), characterized in that a tread portion center region is defined as a region on an inner side in the tire width direction demarcated by the outermost through grooves on an outermost side in the tire width direction, and the center blocks (51, 52) are defined as blocks disposed in the thread portion center region, wherein a ratio of a ground contact area of the innermost center block to a sum of ground contact areas (S1, S2) of the center blocks (51, 52) is in a range of 0.30 or more and 0.50 or less. a plurality of first inclined main grooves that extend while inclining to one side with respect to a tire circumferential direction, open to a tire equatorial plane and a tire ground contact edge on the one side and extend beyond the tire equatorial plane; a plurality of second inclined main grooves that extend while inclining to an other side in the tire circumferential direction, open to the tire equatorial plane and a tire ground contact edge on the other side and extend beyond the tire equatorial plane; a plurality of first land portions that are defined by a pair of the first inclined main grooves adjacent to each other and by one of the second inclined main grooves, the plurality of first land portions extending from the tire equatorial plane to the tire ground contact edge on the one side; and a plurality of second land portions that are defined by a pair of the second inclined main grooves adjacent to each other and by one of the first inclined main grooves, the plurality of second land portions extending from the tire equatorial plane to the tire ground contact edge on the other side, the plurality of first land portions being arrayed adjacent to each other in the tire circumferential direction, the plurality of second land portions being arrayed adjacent to each other in the tire circumferential direction, the first land portions and the second land portions being arrayed in a staggered manner along the tire equatorial plane, the first land portions and the second land portions each comprising a plurality of through grooves (41, 42) that extend through the land portion (3A, 3B) and open to the pair of inclined main grooves (2A, 2B), and a plurality of blocks (51, 52, 53) defined by the through grooves (41, 42), the blocks comprising an innermost center block that is defined as a block closest to the tire equatorial plane, and the innermost center block comprising an edge portion that comprises a notch portion opening to a position where an inclined main groove (2A, 2B) on one side connects sideways in a Y-shape to an inclined main groove (2B, 2A) on the other side, and is disposed on an extension line of a groove center line of the inclined main groove (2A,2B) on the one side at this connection portion of the inclined main grooves (2A, 2B), characterized in that a tread portion center region is defined as a region on an inner side in the tire width direction demarcated by the outermost through grooves on an outermost side in the tire width direction, and the center blocks (51, 52) are defined as blocks disposed in the thread portion center region, wherein a ratio of a ground contact area of the innermost center block to a sum of ground contact areas (S1, S2) of the center blocks (51, 52) is in a range of 0.30 or more and 0.50 or less.