A pneumatic tire comprising a plurality of circumferential main grooves (2, 2a, 2b) extending in a tire circumferential direction on the tread surface; characterized by: in a widthwise outermost land portion (3, 3a, 3c) defined by a tread edge and by the circumferential main groove located farthest outward in a tire width direction, a plurality of widthwise grooves extending from the tread edge inward in the tire width direction and a plurality of widthwise sipes extending from a tire widthwise inner edge of the widthwise grooves inward in the tire width direction and connecting to the circumferential main groove, wherein each widthwise sipe includes a widened portion, on a sipe bottom side, at which a sipe width is larger than on the tread surface side, in a contact patch when the pneumatic tire is mounted on an applicable rim, filled to a prescribed internal pressure, and subjected to a maximum load, a rectangle ratio of a ground contact length LE at a position, in the tire width direction, located 10% of a ground contact width W inward in the tire width direction from a tire widthwise edge to a ground contact length LC at a center of the contact patch in the tire width direction is 0.8 or more, each widthwise sipe extends while inclined at a first inclination angle relative to the tire width direction in plan view of the tread surface, and in a tire radial region in which the widened portion is located, the widened portion extends while inclined at a second inclination angle smaller than the first inclination angle relative to the tire width direction, or includes a portion extending along the tire width direction, and wherein the first inclination angle is from 20° to 45°. in a widthwise outermost land portion (3, 3a, 3c) defined by a tread edge and by the circumferential main groove located farthest outward in a tire width direction, a plurality of widthwise grooves extending from the tread edge inward in the tire width direction and a plurality of widthwise sipes extending from a tire widthwise inner edge of the widthwise grooves inward in the tire width direction and connecting to the circumferential main groove, wherein each widthwise sipe includes a widened portion, on a sipe bottom side, at which a sipe width is larger than on the tread surface side, in a contact patch when the pneumatic tire is mounted on an applicable rim, filled to a prescribed internal pressure, and subjected to a maximum load, a rectangle ratio of a ground contact length LE at a position, in the tire width direction, located 10% of a ground contact width W inward in the tire width direction from a tire widthwise edge to a ground contact length LC at a center of the contact patch in the tire width direction is 0.8 or more, each widthwise sipe extends while inclined at a first inclination angle relative to the tire width direction in plan view of the tread surface, and in a tire radial region in which the widened portion is located, the widened portion extends while inclined at a second inclination angle smaller than the first inclination angle relative to the tire width direction, or includes a portion extending along the tire width direction, and wherein the first inclination angle is from 20° to 45°.