Pneumatic tire

A pneumatic tire comprising:

• a groove formed in a tread, the groove having a groove bottom and groove side surfaces arising from the groove bottom;
• and
• a projection projecting from the groove bottom, wherein
• the projection includes a low-step portion located at a low position with reference to the groove bottom and a high-step portion located at a high position with reference to the groove bottom,
• the low-step portion includes a plurality of inclined surfaces formed in spiral form so as to surround the high-step portion,
• the plurality of inclined surfaces are connected in a direction in which the inclined surfaces sequentially descend,
• the low-step portion includes a first-side inclined surface inclined in a depth direction of the groove along a first groove side surface of the groove and a second-side inclined surface inclined in the depth direction of the groove along a second groove side surface of the groove, and
• the first-side inclined surface and the second-side inclined surface are inclined in different directions from each other.