This addition-curable silicone composition contains (A) an organopolysiloxane having at least two unsaturated aliphatic hydrocarbon groups in each molecule, (B) an organohydrogenpolysiloxane in an amount that provides a value of 0.5-5 for the ratio of the number of SiH groups to the total number of unsaturated aliphatic hydrocarbon groups in the component (A), and (C) an effective amount of hydrosilylation catalyst microparticles that have a microcapsule structure containing a platinum-group metal catalyst-containing organic compound or polymer compound as a core material and a three-dimensional crosslinked polymer compound obtained by polymerizing at least one polyfunctional monomer as a wall material, the platinum-group metal catalyst-containing organic compound or polymer compound having a dynamic viscosity of 10-100,000 mm2/s at 25° C.