A silicone rubber composition comprising: 100 parts by weight of organopolysiloxane containing at least two alkenyl groups per molecule and having the average compositional formula: R n SiO (4-n)/2 wherein R is each independently a substituted or unsubstituted, monovalent hydrocarbon group and n is a positive number of 1.95 to 2.05, 5 to 100 parts by weight of reinforcing silica having a specific surface area of at least 50 m 2 /g, 0.001 to 10 parts by weight of inorganic particle-polysiloxane composite comprising inorganic particles and a polysiloxane containing SiR 2 R 3 CO 2/2 and SiR 4 R 5 R 6 O 1/2 units grafted at least in part onto the particle surfaces, the inorganic particles having a 50% cumulative particle size of 1 to 200 nm in volume basis particle size distribution as measured by the dynamic light scattering method, the polysiloxane optionally being bonded to the inorganic particle surface via a siloxane coating layer containing SiR 1 O 3/2 units, and the total amount of the siloxane constituents represented by SiR 1 O 3/2, SiR 2 R 3 O 2/2, and SiR 4 R 5 R 6 O 1/2 units being from 20 to 20,000 parts by weight per 100 parts by weight of the inorganic particles, wherein each R 1 independently is hydrogen or a group selected from C 1 -C 20 alkyl group, C 2 -C 20 alkenyl group, C 6 -C 20 aryl group and (poly)dimethylsiloxy group of up to 50 silicon atoms, which group may be substituted with (meth)acrylic, oxiranyl, amino, mercapto, isocyanate or fluorine radical, each R 2, R 3, R 4 and R 5 independently is hydrogen or a group selected from C 1 -C 20 alkyl group, C 2 -C 20 alkenyl group, C 6 -C 20 aryl group and (poly)dimethylsiloxy group of up to 50 silicon atoms, which group may be substituted with (meth)acrylic, oxiranyl or fluorine radical, and R 6 is hydrogen or a group selected from C 1 -C 20 alkyl group, C 2 -C 20 alkenyl group, C 6 -C 20 aryl group, (poly)dimethylsiloxy group of up to 50 silicon atoms, C 1 -C 10 alkoxy group and hydroxyl group, which may be substituted with a (meth)acrylic, oxiranyl or fluorine radical, and a curing agent. 100 parts by weight of organopolysiloxane containing at least two alkenyl groups per molecule and having the average compositional formula: R n SiO (4-n)/2 wherein R is each independently a substituted or unsubstituted, monovalent hydrocarbon group and n is a positive number of 1.95 to 2.05, 5 to 100 parts by weight of reinforcing silica having a specific surface area of at least 50 m 2 /g, 0.001 to 10 parts by weight of inorganic particle-polysiloxane composite comprising inorganic particles and a polysiloxane containing SiR 2 R 3 CO 2/2 and SiR 4 R 5 R 6 O 1/2 units grafted at least in part onto the particle surfaces, the inorganic particles having a 50% cumulative particle size of 1 to 200 nm in volume basis particle size distribution as measured by the dynamic light scattering method, the polysiloxane optionally being bonded to the inorganic particle surface via a siloxane coating layer containing SiR 1 O 3/2 units, and the total amount of the siloxane constituents represented by SiR 1 O 3/2, SiR 2 R 3 O 2/2, and SiR 4 R 5 R 6 O 1/2 units being from 20 to 20,000 parts by weight per 100 parts by weight of the inorganic particles, wherein each R 1 independently is hydrogen or a group selected from C 1 -C 20 alkyl group, C 2 -C 20 alkenyl group, C 6 -C 20 aryl group and (poly)dimethylsiloxy group of up to 50 silicon atoms, which group may be substituted with (meth)acrylic, oxiranyl, amino, mercapto, isocyanate or fluorine radical, each R 2, R 3, R 4 and R 5 independently is hydrogen or a group selected from C 1 -C 20 alkyl group, C 2 -C 20 alkenyl group, C 6 -C 20 aryl group and (poly)dimethylsiloxy group of up to 50 silicon atoms, which group may be substituted with (meth)acrylic, oxiranyl or fluorine radical, and R 6 is hydrogen or a group selected from C 1 -C 20 alkyl group, C 2 -C 20 alkenyl group, C 6 -C 20 aryl group, (poly)dimethylsiloxy group of up to 50 silicon atoms, C 1 -C 10 alkoxy group and hydroxyl group, which may be substituted with a (meth)acrylic, oxiranyl or fluorine radical, and a curing agent.