An organo-modified silicone obtained by an addition reaction of (I) a chain silicone represented by formula (1): wherein the formula (1), R1s represent hydrocarbon groups having 1 to 3 carbon atoms, and a and b are numbers satisfying conditions represented by the following formulae (i) to (iii): 0≦a≦195  (i) 5≦b  (ii) 10≦a+b≦200  (iii), with (II) a hydrocarbon such as monoolefins and aromatic hydrocarbons, and (III) a di(meth)acrylic acid ester, at a molar ratio satisfying conditions represented by the following formula (iv): {the chain silicone}:{the hydrocarbon}:{the di(meth)acrylic acid ester}=A:B:C  (iv) wherein the formula (iv), A represents a number of moles of the chain silicone, and B and C are numbers satisfying conditions represented by the following formulae (v) and (vi): 0.05A≦C≦A  (v) A×b−2C=B  (vi) in the presence of a hydrosilylation catalyst.