A pneumatic tire comprising, in at least a portion of a tread surface located between both tread ends: one or more main grooves (1, 2) extending in a tire circumferential direction; and a plurality of lateral grooves extending in a tire width direction between the main grooves (1, 2) and/or between the main groove (1, 2) and the tread end, the main grooves (1, 2) and the lateral grooves defining a block row formed by a plurality of blocks, at least one sipe being disposed in each block, each block having formed therein: a first cutaway groove with one end opening into a lateral groove located on one side of the block in the tire circumferential direction and the other end terminating within the block; a second cutaway groove with one end opening into a lateral groove located on the other side of the block in the tire circumferential direction and the other end terminating within the block; and a connecting narrow groove having a groove width narrower than that of the first cutaway groove and the second cutaway groove and connecting the first cutaway groove and the second cutaway groove, characterised in that a groove depth of the first cutaway groove and the second cutaway groove decreases from the opening side towards the terminating side and a rigidity of the block increases from an opening side of the first cutaway groove towards a terminating side of the first cutaway groove and increases from an opening side of the second cutaway groove towards a terminating side of the second cutaway groove. one or more main grooves (1, 2) extending in a tire circumferential direction; and a plurality of lateral grooves extending in a tire width direction between the main grooves (1, 2) and/or between the main groove (1, 2) and the tread end, the main grooves (1, 2) and the lateral grooves defining a block row formed by a plurality of blocks, at least one sipe being disposed in each block, each block having formed therein: a first cutaway groove with one end opening into a lateral groove located on one side of the block in the tire circumferential direction and the other end terminating within the block; a second cutaway groove with one end opening into a lateral groove located on the other side of the block in the tire circumferential direction and the other end terminating within the block; and a connecting narrow groove having a groove width narrower than that of the first cutaway groove and the second cutaway groove and connecting the first cutaway groove and the second cutaway groove, characterised in that a groove depth of the first cutaway groove and the second cutaway groove decreases from the opening side towards the terminating side and a rigidity of the block increases from an opening side of the first cutaway groove towards a terminating side of the first cutaway groove and increases from an opening side of the second cutaway groove towards a terminating side of the second cutaway groove. a first cutaway groove with one end opening into a lateral groove located on one side of the block in the tire circumferential direction and the other end terminating within the block; a second cutaway groove with one end opening into a lateral groove located on the other side of the block in the tire circumferential direction and the other end terminating within the block; and a connecting narrow groove having a groove width narrower than that of the first cutaway groove and the second cutaway groove and connecting the first cutaway groove and the second cutaway groove, characterised in that a groove depth of the first cutaway groove and the second cutaway groove decreases from the opening side towards the terminating side and a rigidity of the block increases from an opening side of the first cutaway groove towards a terminating side of the first cutaway groove and increases from an opening side of the second cutaway groove towards a terminating side of the second cutaway groove.