The invention provides a semiconductive silicone rubber composition comprising (A) an organopolysiloxane containing at least two aliphatic unsaturated groups, (B) reinforcing silica powder having a specific surface area of at least 50 m.sup.2 /g, (C) a conductive agent, (D) a hydrocarbon oil having a heat loss of up to 30% at 200.degree. C./4 hours, and (E) a curing agent. Cured silicone rubber of the composition has a resistance of 1.times.10.sup.3 to 1.times.10.sup.12 .OMEGA. which remains stable for long-term use. The semiconductive silicone rubber composition is appropriate as a semiconductive roll stock for the manufacture of charging rolls, transfer rolls and developing rolls in business machines.