An addition-curable silicone composition is provided. The composition includes (A) a resin structure organopolysiloxane and (B) a platinum group metal-based catalyst. The component (A) has silicon-bonded alkenyl groups and hydrosilyl groups, and includes a structure in which R22SiO units, wherein R2 is a methyl group, etc., are connected together in a continuous repeating sequence, and the number of units in the continuous repeating sequence is within a range from 5 to 300. The composition can be prepared in a solid or semisolid form, and hence is suitable conventional molding apparatus such as a transfer molding apparatus, and upon curing, forms a hard resin cured product that exhibits excellent flexibility and minimal surface tack.