Water discharge performance and noise performance are improved in a balanced manner. A pneumatic tire has a major groove (3) provided to a tread part (2). In a transverse cross section, the major groove (3) has a first groove wall (10), a second groove wall (11), and a groove floor (12). The groove floor (12) includes a protruding part (13) that is convex outward in a tire radial direction. The protruding part (13) continues along the major groove (3). The width (W3) of the protruding part (13) in a direction perpendicular to a groove center line (G1) of the major groove (3) is 50% to 100% of the groove width (W1) of the major groove (3). The protruding part (13) juts outward in the tire radial direction from an imaginary groove floor (12A) that connects an inner end (10i) of the first groove wall and an inner end (11i) of the second groove wall in a straight line, and the cross-sectional area of the protruding part (13) is 3% to 15% of the transverse cross-sectional area of the major groove (3).