PURPOSE: To reduce noise from a tire.

CONSTITUTION: Hollow parts 2 which do not continue with each other are formed on a tread ground contact part 1 with clearance in a circumferential and width directions, the outline shape of the respective hollow parts 2 is formed so that the front side in a tire rotational direction may be narrower and the width may gradually become larger toward the rear side, and the crossing angle between hollow part central lines Y-Y which cross a tire equator X-X on the more frontal side in the rotational direction of the tire from the respective hollow parts 2, and the tire equator is made larger toward the farther part from the tire equator.