Pneumatic tire

A pneumatic tire that includes on a tread a plurality of circumferential main grooves extending in a tire-circumferential direction and a plurality of land portions formed by being partitioned by the circumferential main grooves, the pneumatic tire comprising:

• a protrusion that is formed on a groove bottom of at least one of the circumferential main grooves and extends along a groove-length direction of the circumferential main groove, and of which a height h1 is corrugated in a curvilinear wavelike form along the groove-length direction;
• a junction that couples the protrusion onto at least one of groove walls of the circumferential main groove,
• a plurality of the junctions are alternately arranged on both sides of the protrusion along the groove-length direction of the circumferential main groove, such that junctions on opposite sides of the protrusion are not aligned with each other in a width direction, and
• each of the junctions couples the protrusion onto only one of the groove walls of the circumferential main groove, and
• wherein a groove width W of the circumferential main groove and an arrangement interval P for the junction satisfy relation of 0.3≦W/P≦2.0.