A thermally conductive silicone gel composition comprising: an alkenyl group-containing organopolysiloxane having a viscosity at 25°C of 10 to 100,000 mPa·s as measured by the method disclosed in the description, in an amount of 100 parts by mass; an organohydrogenpolysiloxane in an amount such that the silicon-bonded hydrogen atoms in component are from 0.2 to 5 mol per mol of alkenyl groups in component; a hydrosilylation reaction catalyst in a catalytic amount; a thermally conductive filler in an amount from 1,200 to 7,500 parts by mass; one or more silane coupling agents or hydrolyzed condensates thereof; and an organopolysiloxane represented by general formula or general formula below or a mixture of these; wherein the total amount of component and component is 0.1 to 5.0% by mass and the mass ratio of component to component is in a range from 5:95 to 95:5 when the total mass of component in the composition is 100% by mass; (i) Organopolysiloxanes having a viscosity at 25°C of from 10 to less than 10,000 mPa·s as measured by the method disclosed in the description, represented by general formula: (In this formula, R 1 represents an unsubstituted or substituted monovalent hydrocarbon group, each R 2 independently represents a hydrogen atom, an alkyl group, an alkoxyalkyl group, or an acyl group, a is an integer from 5 to 250, and b is an integer from 1 to 3.) (ii) Organopolysiloxanes represented by general formula: R 4 3 SiO(R 4 2 SiO) p R 4 2 Si-R 5 -SiR 4 (3-d) (OR 2) d (In this formula, R 4 represents the same or different monovalent hydrocarbon group, R 5 is an oxygen atom or a divalent hydrocarbon group, R 2 is the same as above, p is an integer from 100 to 500, and d is an integer from 1 to 3.) and wherein the thermal conductivity is at least 3.5 W/mK, as measured by the method disclosed in the description, the viscosity at a strain rate of 10 (1/s) is in a range from 50 to 400 Pa·s, and the viscosity at a strain rate of 1 (1/s) is 2.0 or more times the viscosity at a strain rate of 10 (1/s) and measured for each strain rate (1/s) at 25°C using a rheometer. an alkenyl group-containing organopolysiloxane having a viscosity at 25°C of 10 to 100,000 mPa·s as measured by the method disclosed in the description, in an amount of 100 parts by mass; an organohydrogenpolysiloxane in an amount such that the silicon-bonded hydrogen atoms in component are from 0.2 to 5 mol per mol of alkenyl groups in component; a hydrosilylation reaction catalyst in a catalytic amount; a thermally conductive filler in an amount from 1,200 to 7,500 parts by mass; one or more silane coupling agents or hydrolyzed condensates thereof; and an organopolysiloxane represented by general formula or general formula below or a mixture of these; wherein the total amount of component and component is 0.1 to 5.0% by mass and the mass ratio of component to component is in a range from 5:95 to 95:5 when the total mass of component in the composition is 100% by mass; (i) Organopolysiloxanes having a viscosity at 25°C of from 10 to less than 10,000 mPa·s as measured by the method disclosed in the description, represented by general formula: (In this formula, R 1 represents an unsubstituted or substituted monovalent hydrocarbon group, each R 2 independently represents a hydrogen atom, an alkyl group, an alkoxyalkyl group, or an acyl group, a is an integer from 5 to 250, and b is an integer from 1 to 3.) (ii) Organopolysiloxanes represented by general formula: R 4 3 SiO(R 4 2 SiO) p R 4 2 Si-R 5 -SiR 4 (3-d) (OR 2) d (In this formula, R 4 represents the same or different monovalent hydrocarbon group, R 5 is an oxygen atom or a divalent hydrocarbon group, R 2 is the same as above, p is an integer from 100 to 500, and d is an integer from 1 to 3.) (i) Organopolysiloxanes having a viscosity at 25°C of from 10 to less than 10,000 mPa·s as measured by the method disclosed in the description, represented by general formula: (In this formula, R 1 represents an unsubstituted or substituted monovalent hydrocarbon group, each R 2 independently represents a hydrogen atom, an alkyl group, an alkoxyalkyl group, or an acyl group, a is an integer from 5 to 250, and b is an integer from 1 to 3.) (ii) Organopolysiloxanes represented by general formula: R 4 3 SiO(R 4 2 SiO) p R 4 2 Si-R 5 -SiR 4 (3-d) (OR 2) d (In this formula, R 4 represents the same or different monovalent hydrocarbon group, R 5 is an oxygen atom or a divalent hydrocarbon group, R 2 is the same as above, p is an integer from 100 to 500, and d is an integer from 1 to 3.) and wherein the thermal conductivity is at least 3.5 W/mK, as measured by the method disclosed in the description, the viscosity at a strain rate of 10 (1/s) is in a range from 50 to 400 Pa·s, and the viscosity at a strain rate of 1 (1/s) is 2.0 or more times the viscosity at a strain rate of 10 (1/s) and measured for each strain rate (1/s) at 25°C using a rheometer.