At least two or more components of thermoplastic resins are compounded by chaotic mixing to form a polymer alloy with a sophisticatedly controlled dispersed phase structure. In the polymer alloy, a dispersed phase having a non-periodic structure with a correlation length of 0.001 μm to 0.5 μm and having a compactness (C) of 0.05≦(C)≦0.8, wherein the compactness (C) can form a molded product that also has transparency while maintaining the original good heat resistance or mechanical properties of the resins blended.