To provide a more inexpensive rubber composition capable of obtaining high performance, in particular, high breaking characteristic by improvement of a softening agent component as compared with conventional.

In the rubber composition, a mixture of asphalt and a vulcanized rubber powder is formulated relative to a diene based rubber, and an average particle diameter of the vulcanized rubber powder is 0.2 mm or less. The mixture of the asphalt and the vulcanized rubber powder can be prepared by mixing/stirring them at 120C or higher for 1 hour or longer. As the vulcanized rubber powder, the one obtained from a used rubber product, in particular, a waste tire can be preferably used.