A heavy load radial tire is disclosed, wherein a sub-carcass layer (6) having a cord angle substantially equal to that of a carcass layer (3) is disposed on the carcass layer (3), and at least one belt layer (5) whose cords (5a) cross at right angles the cords (6a) of the sub-carcass layer (6) is disposed on the sub-carcass layer (6).
