A pneumatic tire including a land portion on a tread portion, the land portion being provided with a sipe that has amplitude in a tire circumferential direction and that extends in a tire width direction, wherein in a depth direction extending from a land portion surface toward an inner side in a tire radial direction, the sipe comprises: a land portion's surface-side part (5a 1) that is bent toward the tire circumferential direction from the land portion surface so that it is convex in the tire circumferential direction; and a land portion's bottom-side part (5a 2) that is bent toward the tire circumferential direction so that it is convex in the tire circumferential direction, the bottom side part bent toward the tire circumferential direction by a displacement different from a displacement of the land portion's surface-side part, wherein the displacement of the land portion's bottom-side part (5a 2) in the tire circumferential direction is greater than the displacement of the land portion's surface-side part (5a 1) in the tire circumferential direction, wherein the displacement of the land portion's bottom-side part (5a 2) in the tire circumferential direction is equal to twice the amplitude in the tire circumferential direction of the sipe at the land portion's bottom-side part (5a 2), and the displacement of the land portion's surface-side part (5a 1) in the tire circumferential direction is equal to twice the amplitude in the tire circumferential direction of the sipe at the land portion's surface-side part (5a 1), wherein the sipe extends in the tire radial direction while maintaining the same pattern as the zigzag pattern of the sipe present on the surface of the land portion, characterized in that the sipe extends toward opposite sides in the tire circumferential direction alternately, in a zigzag manner, while extending toward the inner side in the tire radial direction. a land portion's surface-side part (5a 1) that is bent toward the tire circumferential direction from the land portion surface so that it is convex in the tire circumferential direction; and a land portion's bottom-side part (5a 2) that is bent toward the tire circumferential direction so that it is convex in the tire circumferential direction, the bottom side part bent toward the tire circumferential direction by a displacement different from a displacement of the land portion's surface-side part, wherein the displacement of the land portion's bottom-side part (5a 2) in the tire circumferential direction is greater than the displacement of the land portion's surface-side part (5a 1) in the tire circumferential direction, wherein the displacement of the land portion's bottom-side part (5a 2) in the tire circumferential direction is equal to twice the amplitude in the tire circumferential direction of the sipe at the land portion's bottom-side part (5a 2), and the displacement of the land portion's surface-side part (5a 1) in the tire circumferential direction is equal to twice the amplitude in the tire circumferential direction of the sipe at the land portion's surface-side part (5a 1), wherein the sipe extends in the tire radial direction while maintaining the same pattern as the zigzag pattern of the sipe present on the surface of the land portion, characterized in that the sipe extends toward opposite sides in the tire circumferential direction alternately, in a zigzag manner, while extending toward the inner side in the tire radial direction.