A tire for a vehicle, comprising four or more circumferential grooves which include a first circumferential groove located on the outermost side in the tire width direction and a second circumferential groove adjacent to the inside in the tire width direction of the first circumferential groove; and wherein the tire rotates in a tire rotating direction during forward movement of the vehicle and an air flow in a direction opposite to the tire rotating direction is generated in the first circumferential groove and the second circumferential groove during traveling of the vehicle; and wherein the tire rotating direction is designated corresponding to the tread pattern of the tire, and the tire is to be installed on the vehicle so that the tire rotating direction is compatible; the tire comprising: a first land part arranged outside the first circumferential groove in the tire width direction, a second land part arranged inside the second circumferential groove in the tire width direction, a plurality of width direction grooves each of which extends with an inclination between the first circumferential groove and the second circumferential groove with respect to the tire width direction and has a first end opened to the first circumferential groove and a second end opened to the second circumferential groove, and a plurality of blocks partitioned between the first circumferential groove and the second circumferential groove by the first circumferential groove, the second circumferential groove, and the plurality of width direction grooves, wherein the plurality of blocks are arranged in parallel in the tire circumferential direction; the first end of each of the width direction grooves is located in a further upstream side of the second end of each of the width direction grooves in the air flow direction; a pair of the first circumferential groove and the second circumferential groove is arranged between a tire equatorial plane and a shoulder portion on both sides of the tire equatorial plane; the tire equatorial plane is located on a center part of a tread portion of the tire in the tire width direction, and the shoulder portions of the tire are located outside the tread portion in the tire width direction; the groove bottom surfaces of the first circumferential grooves, the second circumferential grooves and the plurality of width direction grooves are smooth surfaces without convexity and concavity, characterized in that: each land part (15, 16) is a rib-shaped land part continuously extending in the tire circumferential direction without being divided in the tire circumferential direction, and depths of the first circumferential grooves, the second circumferential grooves and the plurality of width direction grooves are the same. a first land part arranged outside the first circumferential groove in the tire width direction, a second land part arranged inside the second circumferential groove in the tire width direction, a plurality of width direction grooves each of which extends with an inclination between the first circumferential groove and the second circumferential groove with respect to the tire width direction and has a first end opened to the first circumferential groove and a second end opened to the second circumferential groove, and a plurality of blocks partitioned between the first circumferential groove and the second circumferential groove by the first circumferential groove, the second circumferential groove, and the plurality of width direction grooves, wherein the plurality of blocks are arranged in parallel in the tire circumferential direction; the first end of each of the width direction grooves is located in a further upstream side of the second end of each of the width direction grooves in the air flow direction; a pair of the first circumferential groove and the second circumferential groove is arranged between a tire equatorial plane and a shoulder portion on both sides of the tire equatorial plane; the tire equatorial plane is located on a center part of a tread portion of the tire in the tire width direction, and the shoulder portions of the tire are located outside the tread portion in the tire width direction; the groove bottom surfaces of the first circumferential grooves, the second circumferential grooves and the plurality of width direction grooves are smooth surfaces without convexity and concavity, characterized in that: each land part (15, 16) is a rib-shaped land part continuously extending in the tire circumferential direction without being divided in the tire circumferential direction, and depths of the first circumferential grooves, the second circumferential grooves and the plurality of width direction grooves are the same. each land part (15, 16) is a rib-shaped land part continuously extending in the tire circumferential direction without being divided in the tire circumferential direction, and depths of the first circumferential grooves, the second circumferential grooves and the plurality of width direction grooves are the same.