TIRE

To improve pin drop resistance performance and steering stability performance on icy and snowy road surfaces. [0002] Solving Means [0003] A pneumatic tire (1) including a plurality of first blocks (24A) disposed in a first region (A) on one side in a tire width direction demarcated by a tire equatorial plane (CL) in a tread portion (2), and a plurality of second blocks (24B) disposed in a second region (B) on an other side in the tire width direction demarcated by the tire equatorial plane (CL) in the tread portion (2), stud pins (8) being mounted in tire ground contact surfaces (21) of the first blocks (24A) and the second blocks (24B), the first blocks (24A) having a shape that is longer in a tire circumferential direction and forming circumferential rows in which a plurality of the first blocks (24A) are arranged side by side in the tire circumferential direction, the first blocks (24A) in each of the circumferential rows being arranged in a staggered manner in the tire width direction, and an outer circumferential groove (22o) provided between the circumferential rows being formed in a curvilinear manner.