An addition curable type silicone resin composition which comprises: (a) an organopolysiloxane having two or more alkenyl groups bonded to a silicon atom(s) in one molecule, and having a viscosity at 25°C of 50 to 100,000 mPa·s, (b) an organopolysiloxane represented by the following average composition formula, and is a liquid having a viscosity at 25°C of 1,000 Pa·s or more or a solid: an amount of the component (b) being more than 0 part by mass and less than 80 parts by mass based on 100 parts by mass of a total of the component (a) and the component (b), (R 1 R 2 2 SiO 1/2) m (R 1 R 2 SiO 2/2) n (R 2 2 SiO 2/2) p (R 1 SiO 3/2) q (R 2 (OR 3)SiO 2/2) r (SiO 4/2) s ··· wherein, R 1 represents a monovalent hydrocarbon group which may contain an alkenyl group; R 2 represents a monovalent hydrocarbon group which does not contain an alkenyl group, and 80% or more of the whole R 2 is a methyl group; R 3 represents a hydrogen atom or an alkyl group; "m", "n", "p", "q", "r", and "s" are numbers satisfying m≥0, n≥0, p≥0, q≥0, r≥0, s≥0, and are numbers satisfying m+n>0, q+r+s>0, m+n+p+q+r+s=1, (c) an organohydrogen polysiloxane represented by the following average composition formula, having two or more SiH bonds in one molecule, and having a viscosity at 25°C of 1,000 mPa·s or less: in an amount that a number of the SiH bonds of the component (c) being 0.5 to 5.0-fold based on a total of a number of the alkenyl groups of the component (a) and the component (b), R 4 a H b SiO (4-a-b)/2 ··· wherein, R 4 represents a monovalent hydrocarbon group which does not contain an alkenyl group, and 50% or more of the whole R 4 is a methyl group; and "a" and "b" are numbers satisfying 0.7≤a≤2.1, 0.001≤b≤1.0, and 0.8≤a+b≤3.0, (d) a platinum group metal catalyst: in an amount of 1 to 500 ppm in terms of a mass of metal atoms based on a total of the components (a) to (c), and (e) a polyorganometallosiloxane containing an Si-O-Ce bond, and an Si-O-Ti bond, a Ce content of which is 50 to 5,000 ppm, a Ti content of which is 50 to 5,000 ppm, and having a viscosity at 25°C of 10 to 10,000 mPa·s: in an amount of 0.01 to 5 parts by mass based on 100 parts by mass of a total of the components (a) to (d), which cures by heating, wherein a total light transmittance of a sheet having a thickness of 2 mm of a cured product of the composition at a wavelength of 400 nm of 80% or more, and a weight reduction ratio of the cured product after storage at 250°C for 500 hours of within 10%, as measured according to the methods mentioned in the description. (a) an organopolysiloxane having two or more alkenyl groups bonded to a silicon atom(s) in one molecule, and having a viscosity at 25°C of 50 to 100,000 mPa·s, (b) an organopolysiloxane represented by the following average composition formula, and is a liquid having a viscosity at 25°C of 1,000 Pa·s or more or a solid: an amount of the component (b) being more than 0 part by mass and less than 80 parts by mass based on 100 parts by mass of a total of the component (a) and the component (b), (R 1 R 2 2 SiO 1/2) m (R 1 R 2 SiO 2/2) n (R 2 2 SiO 2/2) p (R 1 SiO 3/2) q (R 2 (OR 3)SiO 2/2) r (SiO 4/2) s ··· wherein, R 1 represents a monovalent hydrocarbon group which may contain an alkenyl group; R 2 represents a monovalent hydrocarbon group which does not contain an alkenyl group, and 80% or more of the whole R 2 is a methyl group; R 3 represents a hydrogen atom or an alkyl group; "m", "n", "p", "q", "r", and "s" are numbers satisfying m≥0, n≥0, p≥0, q≥0, r≥0, s≥0, and are numbers satisfying m+n>0, q+r+s>0, m+n+p+q+r+s=1, (c) an organohydrogen polysiloxane represented by the following average composition formula, having two or more SiH bonds in one molecule, and having a viscosity at 25°C of 1,000 mPa·s or less: in an amount that a number of the SiH bonds of the component (c) being 0.5 to 5.0-fold based on a total of a number of the alkenyl groups of the component (a) and the component (b), R 4 a H b SiO (4-a-b)/2 ··· wherein, R 4 represents a monovalent hydrocarbon group which does not contain an alkenyl group, and 50% or more of the whole R 4 is a methyl group; and "a" and "b" are numbers satisfying 0.7≤a≤2.1, 0.001≤b≤1.0, and 0.8≤a+b≤3.0, (d) a platinum group metal catalyst: in an amount of 1 to 500 ppm in terms of a mass of metal atoms based on a total of the components (a) to (c), and (e) a polyorganometallosiloxane containing an Si-O-Ce bond, and an Si-O-Ti bond, a Ce content of which is 50 to 5,000 ppm, a Ti content of which is 50 to 5,000 ppm, and having a viscosity at 25°C of 10 to 10,000 mPa·s: in an amount of 0.01 to 5 parts by mass based on 100 parts by mass of a total of the components (a) to (d), which cures by heating, wherein a total light transmittance of a sheet having a thickness of 2 mm of a cured product of the composition at a wavelength of 400 nm of 80% or more, and a weight reduction ratio of the cured product after storage at 250°C for 500 hours of within 10%, as measured according to the methods mentioned in the description.