A pneumatic tire comprising: on a tread surface, a plurality of circumferential main grooves extending in a tread circumferential direction, and a plurality of land portions, each land portion being defined between circumferential main grooves adjacent in a tread width direction among the plurality of circumferential main grooves, or by the circumferential main groove and a tread edge, wherein the land portion includes a plurality of widthwise grooves extending in the tread width direction, the widthwise groove includes a widened portion, on a groove bottom side, at which a groove width is larger than on the tread surface side, when the pneumatic tire is mounted on an applicable rim, filled to a prescribed internal pressure, and under no load, a groove depth position, farthest outward in a tire radial direction, at which the groove width of the widened portion of the widthwise groove is 2.5 or more times an opening width of the widthwise groove at the tread surface, is designated as a reference depth position, in a tire radial direction region including at least the reference depth position, a storage modulus of first tread rubber is larger than a storage modulus of second tread rubber located in a region around the first tread rubber, the first tread rubber being a groove wall surface layer defined by the widened portion and covering at least part of the widened portion, the first tread rubber is in the shape of a circular ring, with a discontinuous portion, in a tread circumferential cross-section, in the tread circumferential cross-section, the first tread rubber covers an entire surface of the widened portion, "widthwise groove" refers to a groove extending in the tread width direction and having an opening width of 1.0 mm or more at the tread surface when the pneumatic tire is mounted on an applicable rim, filled to a prescribed internal pressure, and under no load, and "circumferential main groove" refers to a groove extending in the tread circumferential direction and having an opening width of 1.5 mm or more at the tread surface when the pneumatic tire is under the same conditions, and "storage modulus" refers to the storage modulus measured at a temperature of 25°C in accordance with JIS K7244. the land portion includes a plurality of widthwise grooves extending in the tread width direction, the widthwise groove includes a widened portion, on a groove bottom side, at which a groove width is larger than on the tread surface side, when the pneumatic tire is mounted on an applicable rim, filled to a prescribed internal pressure, and under no load, a groove depth position, farthest outward in a tire radial direction, at which the groove width of the widened portion of the widthwise groove is 2.5 or more times an opening width of the widthwise groove at the tread surface, is designated as a reference depth position, in a tire radial direction region including at least the reference depth position, a storage modulus of first tread rubber is larger than a storage modulus of second tread rubber located in a region around the first tread rubber, the first tread rubber being a groove wall surface layer defined by the widened portion and covering at least part of the widened portion, the first tread rubber is in the shape of a circular ring, with a discontinuous portion, in a tread circumferential cross-section, in the tread circumferential cross-section, the first tread rubber covers an entire surface of the widened portion, "widthwise groove" refers to a groove extending in the tread width direction and having an opening width of 1.0 mm or more at the tread surface when the pneumatic tire is mounted on an applicable rim, filled to a prescribed internal pressure, and under no load, and "circumferential main groove" refers to a groove extending in the tread circumferential direction and having an opening width of 1.5 mm or more at the tread surface when the pneumatic tire is under the same conditions, and "storage modulus" refers to the storage modulus measured at a temperature of 25°C in accordance with JIS K7244.