A pneumatic tire comprising, in a tread surface:
- two external circumferential main grooves extending in a tire circumferential direction, in a half portion positioned outside of a tire equatorial plane when the pneumatic tire is installed on a vehicle;
- two internal circumferential main grooves extending in the tire circumferential direction, in a half portion positioned inside of the tire equatorial plane when the pneumatic tire is installed on a vehicle;
- a central land portion defined by one of the external circumferential main grooves and one of the internal circumferential main grooves that are adjacent to each other with the tire equatorial plane in between;
- an external intermediate land portion defined by the two external circumferential main grooves;
- and
- an internal intermediate land portion defined by the two internal circumferential main grooves,
- wherein the central land portion is a rib-shaped land portion continuous in the tire circumferential direction,
- the external intermediate land portion includes external resonators each of which is composed of:
- a first auxiliary groove terminating within the external intermediate land portion at both ends;
- a first branch groove less in groove volume than the first auxiliary groove and having respective ends open to the external circumferential main groove closer to the tire equatorial plane and the first auxiliary groove;
- and a second branch groove less in groove volume than the first auxiliary groove and having respective ends open to the external circumferential main groove on the half portion positioned outside of the tire equatorial plane and the first auxiliary groove,
- the internal intermediate land portion includes internal resonators each of which is composed of:
- a second auxiliary groove terminating within the internal intermediate land portion at both ends;
- a third branch groove less in groove volume than the second auxiliary groove and having respective ends open to the internal circumferential main groove closer to the tire equatorial plane and the second auxiliary groove;
- and a fourth branch groove less in groove volume than the second auxiliary groove and having respective ends open to the internal circumferential main groove on the half portion positioned inside of the tire equatorial plane and the second auxiliary groove,
- the first auxiliary groove is less in groove volume than the second auxiliary groove,
- a total groove width of the two external circumferential main grooves is less than a total groove width of the two internal circumferential main grooves,
- the number of the external resonators is greater than the number of the internal resonators, and
- at least a part of the first auxiliary groove in each of the external resonators in the tire circumferential direction overlaps, in a tire width direction, with a first shallow bottom portion of the first auxiliary groove in an adjacent one of the external resonators in the tire circumferential direction, the first shallow bottom portion being less in groove depth than a first deep bottom portion having a largest groove depth in the first auxiliary groove.