Provided is a curable silicone resin composition including (A) a siloxane/polycyclic hydrocarbon-based compound containing at least 2 silicon-bonded hydrogen atoms, which is an addition reaction product of (a) a siloxane-based compound with at least 3 silicon-bonded hydrogen atoms, and (b) a polycyclic hydrocarbon with at least 2 addition reactive carbon-carbon double bonds, (B) a siloxane-based compound containing at least 2 silicon-bonded alkenyl groups, and (C) a hydrosilylation reaction catalyst. This composition is useful as a material for optical devices or parts, insulation material for electronic devices or parts, or coating material.