A pneumatic tire has a tread rubber which is formed by a nonconductive rubber and includes a conductive portion. The conductive portion comprises a first, second, third and fourth conductive portions. The first conductive portion extends radially inward from the ground-contacting surface and reaches a cap portion. The second conductive portion is provided continuously in the first conductive portion, extends to one side in the tire width direction between the cap portion and a base portion, and reaches a carcass layer. The third conductive portion is connected to the second conductive portion, extends radially inward from an outer surface of the base portion, and reaches the bottom surface of the tread rubber. The fourth conductive portion is provided continuously in the third conductive portion, extends to another side in the tire width direction along the bottom surface, and reaches the carcass layer.