A pneumatic tire comprising: a plurality of circumferential direction grooves formed in a tread and extending along a tire circumferential direction; a fine groove formed in the tread between the circumferential direction grooves so as to partition a rib extending in a tire circumferential direction, the fine groove having a width that is narrower than the circumferential direction grooves, and the groove walls of the fine groove making contact with each other when the tread makes contact with the ground and undergoes compressive deformation; a plurality of lug grooves formed in the tread, the lug grooves extending from the fine groove in a direction that intersects with the fine groove, and partitioning blocks adjacent to the rib; first sipes that are formed in the surface of the blocks, extending along the tire circumferential direction from a first wall face at a lug groove side of the block toward a second wall face at a lug groove side of the block, with the first sipes terminating within the block; second sipes that are formed in the surface of the blocks, the second sipes extending along the tire circumferential direction from the second wall face at a lug groove side of the block toward the first wall face at a lug groove side of the block, and the second sipes curving around, at an intermediate portion between the second wall face and the first wall face, toward a wall face at the fine groove side of the block, with the second sipes open to the wall face at the fine groove side and not intersecting with the first sipes when seen in plan view, wherein the second sipes extending along the tire circumferential direction are formed to the center blocks so as to be along the same straight line as the first sipe. a plurality of circumferential direction grooves formed in a tread and extending along a tire circumferential direction; a fine groove formed in the tread between the circumferential direction grooves so as to partition a rib extending in a tire circumferential direction, the fine groove having a width that is narrower than the circumferential direction grooves, and the groove walls of the fine groove making contact with each other when the tread makes contact with the ground and undergoes compressive deformation; a plurality of lug grooves formed in the tread, the lug grooves extending from the fine groove in a direction that intersects with the fine groove, and partitioning blocks adjacent to the rib; first sipes that are formed in the surface of the blocks, extending along the tire circumferential direction from a first wall face at a lug groove side of the block toward a second wall face at a lug groove side of the block, with the first sipes terminating within the block; second sipes that are formed in the surface of the blocks, the second sipes extending along the tire circumferential direction from the second wall face at a lug groove side of the block toward the first wall face at a lug groove side of the block, and the second sipes curving around, at an intermediate portion between the second wall face and the first wall face, toward a wall face at the fine groove side of the block, with the second sipes open to the wall face at the fine groove side and not intersecting with the first sipes when seen in plan view, wherein the second sipes extending along the tire circumferential direction are formed to the center blocks so as to be along the same straight line as the first sipe.