Room temperature moisture-curable silicone gel composition comprising the following components,,, and: organopolysiloxane having the general formula: HO(SiR 1 2 O) n H wherein R 1 which may be identical or different are substituted or unsubstituted C 1 -C 10 monovalent hydrocarbon groups, and n is an integer of at least 10, hydrolysable organosilicon compound having the general formula and/or partial hydrolysate thereof: wherein R 2 which may be identical or different are substituted or unsubstituted C 1 -C 20 monovalent hydrocarbon groups, each R 3 independently is a substituted or unsubstituted C 1 -C 20 alkyl group or a substituted or unsubstituted C 3 -C 20 cycloalkyl group, and a is 2 or 3, in an amount of 0.01 to 30 parts by weight per 100 parts by weight of component, curing catalyst in an amount of 0.001 to 10 parts by weight per 100 parts by weight of component, and heat resistance enhancer containing a homogeneous mixture of (D-a), (D-b), and (D-c) in an amount of 0.1 to 12 parts by weight per 100 parts by weight of component, (D-a) organopolysiloxane having a viscosity, as determined in accordance with the method outlined in the description, of 10 to 10,000 mPa·s at 25°C, (D-b) cerium carboxylate having the general formula: (R 4 COO) f M 1 wherein R 4 which may be identical or different are monovalent hydrocarbon groups, M 1 is cerium or a rare earth element mixture based on cerium, and f is 3 or 4, in an amount to provide 0.05 to 5 parts by weight of cerium per 100 parts by weight of component (D-a), and (D-c) titanium compound having the general formula and/or a partial hydrolytic condensate thereof: (R 5 O) 4 Ti wherein R 5 which may be identical or different are monovalent hydrocarbon groups, in such an amount that the weight of titanium is 0.01 to 5 times the weight of cerium in component (D-b). organopolysiloxane having the general formula: HO(SiR 1 2 O) n H wherein R 1 which may be identical or different are substituted or unsubstituted C 1 -C 10 monovalent hydrocarbon groups, and n is an integer of at least 10, hydrolysable organosilicon compound having the general formula and/or partial hydrolysate thereof: wherein R 2 which may be identical or different are substituted or unsubstituted C 1 -C 20 monovalent hydrocarbon groups, each R 3 independently is a substituted or unsubstituted C 1 -C 20 alkyl group or a substituted or unsubstituted C 3 -C 20 cycloalkyl group, and a is 2 or 3, in an amount of 0.01 to 30 parts by weight per 100 parts by weight of component, curing catalyst in an amount of 0.001 to 10 parts by weight per 100 parts by weight of component, and heat resistance enhancer containing a homogeneous mixture of (D-a), (D-b), and (D-c) in an amount of 0.1 to 12 parts by weight per 100 parts by weight of component, (D-a) organopolysiloxane having a viscosity, as determined in accordance with the method outlined in the description, of 10 to 10,000 mPa·s at 25°C, (D-b) cerium carboxylate having the general formula: (R 4 COO) f M 1 wherein R 4 which may be identical or different are monovalent hydrocarbon groups, M 1 is cerium or a rare earth element mixture based on cerium, and f is 3 or 4, in an amount to provide 0.05 to 5 parts by weight of cerium per 100 parts by weight of component (D-a), and (D-c) titanium compound having the general formula and/or a partial hydrolytic condensate thereof: (R 5 O) 4 Ti wherein R 5 which may be identical or different are monovalent hydrocarbon groups, in such an amount that the weight of titanium is 0.01 to 5 times the weight of cerium in component (D-b).