To provide a rubber composition for a tire under tread, a tire belt cushion and a tire upper bead filler, which allows the tire under tread, the tire belt cushion and the tire upper bead filler to attain low heat generation properties and high breaking elongation without increasing the viscosity thereof and without deteriorating the modulus of elasticity thereof and to provide a pneumatic tire made by using the rubber composition.

The rubber composition for the tire under tread 31, the tire belt cushion 8 and the tire upper bead filler 62 is obtained by blending 10-40 parts mass oil-extended white clay, 15 parts mass carbon black and 1-10 parts mass silica in 100 parts mass diene rubber so that the total amount of the oil-extended white clay, carbon black and silica to be blended is 40-70 parts mass. The pneumatic tire made by using the rubber composition is provided.