A tire has a lug, a plurality of first recessed regions that extend from a first major groove, and a plurality of second recessed regions that extend from a second major groove. A central region of the lug protrudes relative to either end of the lug. The plurality of first and second recessed regions are arranged in alternating fashion along a tire circumferential direction. The respective recessed regions each has a planar base that extends in a width direction of the each recessed region. The planar base is horizontal, or is inclined in such fashion that a height thereof increases so as to extend further toward an exterior in a tire radial direction as one proceeds toward a center of the each recessed region. Width of the planar base increases as one proceeds from the center in the width direction of the lug to an end of the lug.