The present invention pertains to a curable organopolysiloxane composition comprising at least (A) an organopolysiloxane having at least two alkenyl groups per module, (B) an organopolysiloxane resin represented by average unit formula: (R13SiO1/2)a(R12SiO2/2)b(R2SiO3/2)c(SiO4/2)d. In the formula, R1's are the same or different from each other, and represent a hydrogen atom or a monovalent hydrocarbon group not having an aliphatic unsaturated carbon bond but at least two of the R1's per molecule represent hydrogen atoms, R2 represents a monovalent hydrocarbon group not having an aliphatic unsaturated bond, and a, b, and c are numbers satisfying 0