A pneumatic tire comprising a tread surface provided with two or more circumferential grooves (2, 3, 4) each extending to be inclined with respect to a tread circumferential direction and bent in several locations and also extending continuously in the tread circumferential direction, width direction grooves each opening to two circumferential grooves (2, 3, 4) that are adjacent in a tread width direction, and a plurality of block rows including a plurality of blocks defined by the two or more circumferential grooves (2, 3, 4) and the width direction grooves, wherein respective blocks included in at least two of the plurality of block rows that are adjacent in the tread width direction with one of the two or more circumferential grooves sandwiched therebetween are arranged to be offset relative to each other in the tread circumferential direction, and the one of the two or more circumferential grooves sandwiched therebetween is smaller in groove width than a width direction groove extending between any two of the respective blocks that are adjacent in the tread circumferential direction, the respective blocks each have a block width that is gradually increased from circumferential end portions of the block to a circumferential middle portion of the block in a manner such that widthwise end portions of the block located on both ends of the block in the tread width direction are positioned in a circumferentially intermediate portion of the block, and the respective blocks each also have a maximum circumferential length that is larger than the maximum width of the block, thereby having, in a plane view thereof, a pentagonal or a higher order polygonal contour shape that includes end sides located in the circumferential end portions, and circumferential distances (a, a1) between a circumferential middle position of each of the end sides of the block and a circumferential middle position of a line connecting the widthwise end portions of the block are both twice or more of a maximum depth of the two or more circumferential grooves; characterised in that: the plurality of block rows includes, in a tread half portion, a center block row that is adjacent to the one of the two or more circumferential grooves straddling a tire equatorial plane (eq), a second block row that is adjacent to and located outward in the tread width direction than the center block row, and a shoulder block row that is adjacent to and located outward in the tread width direction than the second block row and that includes some of the plurality of blocks defined by one of the two or more circumferential grooves, some of the width direction grooves, and a tread side edge, and when the center block row, the second block row, and the shoulder block row each have a width that is defined as a mean value of a maximum width of the block measured along the tread width direction row and a minimum width of the block row measured along the tread width direction, the widths of the center block row, the second block row, and the shoulder block row satisfy the following relation the width of the center block row: the width of the second block row: the width of the shoulder block row = 100: (42 to 49): (55 to 65). the plurality of block rows includes, in a tread half portion, a center block row that is adjacent to the one of the two or more circumferential grooves straddling a tire equatorial plane (eq), a second block row that is adjacent to and located outward in the tread width direction than the center block row, and a shoulder block row that is adjacent to and located outward in the tread width direction than the second block row and that includes some of the plurality of blocks defined by one of the two or more circumferential grooves, some of the width direction grooves, and a tread side edge, and when the center block row, the second block row, and the shoulder block row each have a width that is defined as a mean value of a maximum width of the block measured along the tread width direction row and a minimum width of the block row measured along the tread width direction, the widths of the center block row, the second block row, and the shoulder block row satisfy the following relation the width of the center block row: the width of the second block row: the width of the shoulder block row = 100: (42 to 49): (55 to 65).