A tire comprising: a tread portion being provided with a plurality of circumferential grooves continuously extending in a tire circumferential direction, a plurality of lateral grooves extending in a tire axial direction, and a plurality of first blocks , wherein each of the plurality of first blocks is provided with at least one first sipe , in each first block , the at least one first sipe extends in a zigzag shape in both of a cross-section perpendicular to a sipe length direction and a cross-section parallel to a ground contact surface of the first block , in each first block , the at least one first sipe comprises a sipe bottom, and a tie-bar locally raising outwardly in a tire radial direction from the sipe bottom and terminating without reaching the ground contact surface of the first block to divide the at least one first sipe into a first portion and a second portion in the sipe length direction, the sipe bottom of the first portion communicates with a first widening portion having a circular shape in a cross-section perpendicular to the sipe length direction, the first widening portion has a groove width greater than a width of the first portion , the sipe bottom of the second portion communicates with a second widening portion having a circular shape in a cross-section perpendicular to the sipe length direction, the second widening portion has a groove width greater than a width of the second portion , and the first widening portion does not communicate with the second widening portion , characterized in that in each first block , the sipe bottom of the first portion and the sipe bottom of the second portion extend in a zigzag shape in a cross-section parallel to the ground contact surface of the first block , the first widening portion extends in a zigzag shape along the sipe bottom of the first portion , and the second widening portion extends in a zigzag shape along the sipe bottom of the second portion . a tread portion being provided with a plurality of circumferential grooves continuously extending in a tire circumferential direction, a plurality of lateral grooves extending in a tire axial direction, and a plurality of first blocks , wherein each of the plurality of first blocks is provided with at least one first sipe , in each first block , the at least one first sipe extends in a zigzag shape in both of a cross-section perpendicular to a sipe length direction and a cross-section parallel to a ground contact surface of the first block , in each first block , the at least one first sipe comprises a sipe bottom, and a tie-bar locally raising outwardly in a tire radial direction from the sipe bottom and terminating without reaching the ground contact surface of the first block to divide the at least one first sipe into a first portion and a second portion in the sipe length direction, the sipe bottom of the first portion communicates with a first widening portion having a circular shape in a cross-section perpendicular to the sipe length direction, the first widening portion has a groove width greater than a width of the first portion , the sipe bottom of the second portion communicates with a second widening portion having a circular shape in a cross-section perpendicular to the sipe length direction, the second widening portion has a groove width greater than a width of the second portion , and the first widening portion does not communicate with the second widening portion , characterized in that in each first block , the sipe bottom of the first portion and the sipe bottom of the second portion extend in a zigzag shape in a cross-section parallel to the ground contact surface of the first block , the first widening portion extends in a zigzag shape along the sipe bottom of the first portion , and the second widening portion extends in a zigzag shape along the sipe bottom of the second portion . <EOS>