There is provided a pneumatic tire to improve on-ice braking performance. A pneumatic tire comprises plural blocks on a tread surface of the tire defined by plural circumferential grooves extending in a tread circumferential direction and plural lateral grooves extending in a tread width direction and provided with plural sipes extending in the tread width direction, wherein each of the blocks is divided into plural block pieces including at least a set of a first block piece and a second block piece which are arranged next to each other, the first block piece has a width in the tread circumferential direction gradually decreasing from end portions toward a central portion of the block in the tread width direction, the second block piece has a width in the tread circumferential direction gradually increasing from end portions toward a central portion of the block in the tread width direction, the width of the first block piece in the tread circumferential direction gradually decreases toward the tread surface, and the width of the second block piece in the tread circumferential direction gradually increases toward the tread surface.