A tire (1) is provided with multiple projection parts (500) in a groove bottom (50B2) of a groove portion. The projection parts (500) extend from one side wall (50B1) to the other side wall (50B3) opposed to the one side wall (50B1), the side walls forming the groove portion. The projection parts (500) are arranged at predetermined intervals in the groove portion. A relationship of 0.75 L≦P≦10 L is satisfied where L denotes a length of the projection parts (500) and P denotes the predetermined intervals. In addition a relationship of 0.4≦FW/W