A pneumatic tire is disclosed in which ABS braking performance on a wet road after being worn is improved. This pneumatic tire includes: a tread pattern whose rotational direction is specified; and a block plotted on a tread by main grooves extending in a tire circumferential direction and lateral grooves extending in a tire width direction, the block having a pair of opposing corners with acute angles and including at least one sipe therein. In the pneumatic tire, a length of the sipe is made gradually longer from a tread surface toward a sipe bottom part and, assuming that the block is equally divided by a boundary of a straight line parallel to the tire circumferential direction into a region U where a corner of the block in the trailing side has an acute angle and a region L where a corner of the block in the leading side has an acute angle, edge lengths LU, LL of the block measured along the main groove in the regions U, L, and distances 1U, 1L from corners of the block in the trailing side to an opening end of the sipe bottom part measured in the regions U, L are set in relations of 0.4nulllL/LLnull0.8, 0.2nulllU/LUnull0.6, lL/LLnulllU/LU.