To provide a diene-based rubber composition which is improved in durability by improving high rigidity and breaking elongation in a well-balanced state while suppressing the increase of heat generation, and is suitably used as a vulcanization molding material for molding a lower hard bead filler or the like.

The diene-based rubber composition is obtained by blending (a) 100 pts.wt. of diene-based rubber, (b) 10 to 60 pts.wt. of a pulverized material of bituminous coal, (c) 40 pts.wt. of carbon black having a nitrogen adsorption specific surface area (based on JIS K6217-2) of 50 to 160 m2/g and (d) 0.5 to 6 pts.wt. of at least one kind of resin selected from a para-octylphenol resin, a modified gum rosin, a 1,3-pentadiene resin and a dicyclopentadiene resin, wherein the total blending amount of the carbon black and the pulverized material of bituminous coal is 60 to 110 pts.wt.