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.