Abstract: A pneumatic tire includes a first circumferential groove extending in a circumferential direction of the pneumatic tire, a second circumferential groove extending in the circumferential direction of the pneumatic tire, a third circumferential groove extending in the circumferential direction of the pneumatic tire; and a fourth circumferential groove extending in the circumferential direction of the pneumatic tire, the first, second, third, and fourth circumferential grooves defining first, second, third, fourth, and fifth ribs. Each of the ribs includes lateral grooves and lateral sipes. The lateral grooves of the first rib each having chamfers on an upper side at an intersection with the first circumferential groove.