Provided is a pneumatic tire in which improvement is achieved in a wet performance and reduction in vehicle exterior noise while ensuring a dry performance. The pneumatic tire has a designated fitting direction relative to a vehicle, in which four main grooves extending in a circumferential direction of the tire are provided on a tread portion, two grooves out of these main grooves are located on each of both sides of a tire equator, five lines of land portions are defined by the main grooves, a center land portion located on the tire equator is a rib which continuously extends in the circumferential direction of the tire without being sectioned, a plurality of arcuate grooves each extending in an arc shape are provided on each of a pair of second land sections located respectively on both sides of the center land section, an end of each of the arcuate grooves is connected to the main groove on an inner side of the vehicle, another end of the arcuate groove is connected to the adjacent arcuate groove, a repeat pitch Po of the arcuate grooves on the second land portion located on an outer side of the vehicle is set greater than a repeat pitch Pi of the arcuate grooves on the second land portion located on the inner side of the vehicle, and a proportion Po/Pi of the pitches is set in a range from 1.5 to 3.0.