A land block (100) has: a side surface (101) (which constitutes a lateral side surface section) forming a groove wall of a lateral groove (40A); and a side surface (102) (which constitutes a circumferential side surface section) forming a groove wall of a circumferential groove (20A). A protrusion (200) protruding from the side surface (101) in the circumferential direction (tc) of the tire and extending in the radial direction of the tire is formed in the region (101a) of the side surface (101) which is located at a position further toward one side of the side surface (101) in the width direction of the tread than the center of the side surface (101) in the width direction (tw) of the tread.