A tire including, in a tread surface , a plurality of land portions partitioned by a plurality of circumferential main grooves extending continuously in a tire circumferential direction on at least one side in a tire width direction, and comprising, in one of the land portions , a resonator including an auxiliary groove that terminates in the land portion , and at least one branch groove that communicates between the auxiliary groove and one of the circumferential main grooves , wherein a hidden groove having an opening width in the tread surface that is smaller than a groove width of a groove bottom is provided in at least a part of the auxiliary groove , wherein the auxiliary groove comprises the hidden groove , and a revealed groove excluding the hidden groove , the hidden groove comprises an opening side portion having a groove width maintained on an inner side in the tire radial direction in the same manner as in the opening width (W51H) in the tread surface , and a groove bottom side portion having a groove width that is larger than the opening width (W51H) and continuous in the groove depth direction, in order from a tread surface side in cross-sectional view of the plane that is orthogonal to the extending direction of the auxiliary groove , the opening side portion of the hidden groove has a constant groove width, while the groove width of the groove bottom side portion of the hidden groove gradually increases to a vicinity of a middle of the groove bottom side portion in a region from the tread surface side toward a groove bottom side, and then gradually decreases or is maintained constant in a region from the vicinity of the middle of the groove bottom side portion to the groove bottom , and an extension length in the tire radial direction of the opening side of the hidden groove is shorter than that of the groove bottom side, characterized in that the tire includes a vehicle-installed inside half portion (HA) and a vehicle-installed outside half portion (HB), and the groove width of the circumferential main groove that is located in the vehicle-installed inside half portion (HA) and is on a vehicle-installed innermost side is maximum among the plurality of circumferential main grooves . the auxiliary groove comprises the hidden groove , and a revealed groove excluding the hidden groove , the hidden groove comprises an opening side portion having a groove width maintained on an inner side in the tire radial direction in the same manner as in the opening width (W51H) in the tread surface , and a groove bottom side portion having a groove width that is larger than the opening width (W51H) and continuous in the groove depth direction, in order from a tread surface side in cross-sectional view of the plane that is orthogonal to the extending direction of the auxiliary groove , the opening side portion of the hidden groove has a constant groove width, while the groove width of the groove bottom side portion of the hidden groove gradually increases to a vicinity of a middle of the groove bottom side portion in a region from the tread surface side toward a groove bottom side, and then gradually decreases or is maintained constant in a region from the vicinity of the middle of the groove bottom side portion to the groove bottom , and an extension length in the tire radial direction of the opening side of the hidden groove is shorter than that of the groove bottom side, characterized in that the tire includes a vehicle-installed inside half portion (HA) and a vehicle-installed outside half portion (HB), and the groove width of the circumferential main groove that is located in the vehicle-installed inside half portion (HA) and is on a vehicle-installed innermost side is maximum among the plurality of circumferential main grooves . <EOS>