One form of the present invention provides a resin composition and a molded product formed thereof, wherein a polymer composition which includes a thermoplastic base polymer or base polyblend (A), a thermoplastic base polymer or base polyblend (B) having no compatibility with the (A), and fluid (C) included as a nanoparticle suspension having compatibility with neither (A) nor (B) and containing nanoparticles uniformly dispersed at a temperature lower than or equal to the thermal decomposition temperature of (A) or (B), and in which interfaces between three layers made of (A), (B), and (C) form three-dimensional continuous parallel interfaces, and the nanoparticles of (C) having an average particle size from 1 μm to 1 nm after removal of a dispersion medium of (C) by evaporation are locally unevenly dispersed in the pattern of a curve or a straight line connecting consecutive points at a fracture surface, and are macroscopically uniformly dispersed.
