A curable silicone resin composition including: (A) an organopolysiloxane having at least two alkenyl groups per molecule, each bonded to a silicone atom and showing a viscosity of 10 to 1,000,000 mPa·s at 25 degrees C., and (B) an organopolysiloxane having a resin structure composed of 10 to 80 mol % of SiO4/2 unit, 0.1 to 80 mol % of (R1)2SiO2/2 unit and 1 to 60 mol % of (R2)3SiO1/2 unit and having a weight average molecular weight of 1,000 to 10,000. R1 represents an alkenyl group having 2 to 8 carbon atoms, or a substituted or unsubstituted, monovalent hydrocarbon group having no aliphatic unsaturated group, and R2 represents, independently of each other, an alkenyl group having 2 to 8 carbon atoms, or a substituted or unsubstituted, monovalent hydrocarbon group having no aliphatic unsaturated group, provided that at least one among all of R2 is an alkenyl group.