Pneumatic tire

A pneumatic tire comprising:

• a belt layer which is buried in a tread portion;
• a belt reinforcing layer which is arranged in an outer side in a tire diametrical direction of the belt layer and in which a plurality of reinforcing cords extending along a tire circumferential direction are arranged;
• four main grooves which are formed on an outer surface of the tread portion, and are arranged two by two in both sides with a tire equator interposed therebetween;
• and
• land portions which are comparted by the four main grooves,
• wherein the belt reinforcing layer is partitioned into five areas constituted by a first area, a second area, a third area, a fourth area and a fifth area in a tire width direction from a vehicle installation inner side toward a vehicle installation outer side in this order by the four main grooves, an arrangement density of the reinforcing cord in the fifth area is higher than an arrangement density of the reinforcing cord in the first area, and an arrangement density of the reinforcing cord in the second area is higher than an arrangement density of the reinforcing cord in the fourth area, and
• wherein protruding portions having protruding heights in proportion to the arrangement densities are provided on ground surfaces of the land portions which are positioned outside in the tire diametrical direction in the areas having the higher density than that of the third area, out of the first area, the second area, the fourth area and the fifth area.