To provide a diene rubber composition which improves low heat buildup and high durability with good balance, while achieving reduction in weight, and which is suitably used as a rubber material for textile cord coating.

The diene rubber composition is obtained by blending 100 pts.wt. of diene rubber containing 40 pts.wt. of natural rubber and/or isoprene rubber and 5 pts.wt. of styrene-butadiene copolymer rubber with 0.5-5.0 pts.wt. of resorcinol-formalin resin, 0.5-3.0 pts.wt. of a curing agent for resorcinol-formalin resin, 5-20 pts.wt. of bituminous coal pulverized matter and 30-65 pts.wt. of carbon black, wherein the total amount of the bituminous coal pulverized matter and carbon black is 50-70 pts.wt.