A curable silicone gel composition comprising: 100 parts by mass of an organopolysiloxane represented by an average composition formula shown below: R a R 1 b SiO (4-a-b)/2 wherein R represents an alkenyl group, R 1 represents a substituted or unsubstituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, a represents a number within a range from 0.0001 to 0.2 and b represents a number within a range from 1.7 to 2.2, provided that a+b is a number within a range from 1.9 to 2.4, containing at least two alkenyl groups bonded to silicon atoms within each molecule, an organohydrogenpolysiloxane represented by an average composition formula shown below: (HR 2 2 SiO 1/2) c (R 3 3 SiO 1/2) d (R 4 2 SiO) e (R 5 SiO 3/2) f wherein R 2 to R 5 each independently represent identical or different substituted or unsubstituted monovalent hydrocarbon groups that contain no aliphatic unsaturated bonds, c and d each independently represents a number within a range from 0.00001 to 0.3, e represents a number within a range from 0.5 to 0.98, and f represents a number within a range from 0.01 to 0.12, provided that c+d+e+f= 1, containing at least three hydrogen atoms bonded to silicon atoms within each molecule, and containing at least one (R 5 SiO 3/2) unit within each molecule, in an amount that provides 0.1 to 5 hydrogen atoms bonded to silicon atoms per one alkenyl group bonded to a silicon atom within component, wherein the amount of the component is within a range of from 1 to 50 parts by mass per 100 parts by mass of the component, and an effective amount of a platinum-based catalyst, wherein following curing, a penetration value as prescribed in JIS K-6249 is within a range from 10 to 200, and loss coefficient values at 25°C for shear frequency values of 1 Hz and 10 Hz are within a range from 0.1 to 1.0 and within a range from 0.3 to 1.5 respectively. 100 parts by mass of an organopolysiloxane represented by an average composition formula shown below: R a R 1 b SiO (4-a-b)/2 wherein R represents an alkenyl group, R 1 represents a substituted or unsubstituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, a represents a number within a range from 0.0001 to 0.2 and b represents a number within a range from 1.7 to 2.2, provided that a+b is a number within a range from 1.9 to 2.4, containing at least two alkenyl groups bonded to silicon atoms within each molecule, an organohydrogenpolysiloxane represented by an average composition formula shown below: (HR 2 2 SiO 1/2) c (R 3 3 SiO 1/2) d (R 4 2 SiO) e (R 5 SiO 3/2) f wherein R 2 to R 5 each independently represent identical or different substituted or unsubstituted monovalent hydrocarbon groups that contain no aliphatic unsaturated bonds, c and d each independently represents a number within a range from 0.00001 to 0.3, e represents a number within a range from 0.5 to 0.98, and f represents a number within a range from 0.01 to 0.12, provided that c+d+e+f= 1, containing at least three hydrogen atoms bonded to silicon atoms within each molecule, and containing at least one (R 5 SiO 3/2) unit within each molecule, in an amount that provides 0.1 to 5 hydrogen atoms bonded to silicon atoms per one alkenyl group bonded to a silicon atom within component, wherein the amount of the component is within a range of from 1 to 50 parts by mass per 100 parts by mass of the component, and an effective amount of a platinum-based catalyst, wherein following curing, a penetration value as prescribed in JIS K-6249 is within a range from 10 to 200, and loss coefficient values at 25°C for shear frequency values of 1 Hz and 10 Hz are within a range from 0.1 to 1.0 and within a range from 0.3 to 1.5 respectively.