A thermosetting silicone resin composition for reflector of LED has an organopolysiloxane represented by the following average compositional formula, and has at least two alkenyl groups in one molecule, a linear organohydrogen polysiloxane represented by the following formula and/or a branched organohydrogenpolysiloxane represented by the following formula, an addition reaction catalyst, a white pigment selected from titanium oxide, zinc oxide, magnesium oxide, barium carbonate, magnesium silicate, zinc sulfate and barium sulfate, and an inorganic filler other than Component, R1aR2bR3c(OR0)dSiO(4-a-b-c-d)/2  (1) R7eR8fHgSiO(4-e-f-g)/2  (3). There can be a thermosetting silicone resin composition which provides a cured product excellent in heat resistance and light resistance, less leakage of light to outside, and particularly suitable for a matrix array reflector.