TIRE

The tire 10 comprises a widthwise narrow groove 8 extending with a tire widthwise component on a tread surface 11. The widthwise narrow groove 8 has a center-side narrow groove portion 8a located on the inner side in the tire width direction and a shoulder-side narrow groove portion 8b connected to the outer side of the center-side narrow groove portion 8a in the tire width direction, the center-side narrow groove portion 8a is formed, from groove opening side to groove bottom side, in a shape of a continuous series of: a narrow section 8au including the groove opening; a tapered section 8at where the groove width increases toward the groove bottom; a wide straight section 8as extending in the groove depth direction with a constant groove width and having a groove width greater than that of the narrow section; and an arc-shaped section 8ab including the groove bottom, and the shoulder-side narrow groove portion 8b is formed, from groove opening side to groove bottom side, in a shape of a continuous series of: a narrow section 8bu including the groove opening; a tapered section 8bt where the groove width increases toward the groove bottom; and an arc-shaped section 8bb including the groove bottom.