Abstract: The object is to efficiently utilize a starch substance among surplus agricultural product, and the present invention relates to a technique for blending the starch substance with a thermoplastic resin. The purpose of the present invention is to provide a starch resin composition which retains various properties of the thermoplastic resin even when the starch substance is blended in a large amount. There is provided a starch resin composition comprising 5-95 parts by weight of the thermoplastic resin (X), 95-5 parts by weight of starch substance (Y), and 0.2-20 parts by weight of a compatibilizer (Z) which improves an affinity at an interface between the thermoplastic resin (X) and the starch substance (Y), relative to 100 parts by weight of a total amount of the components (X) and (Y), and a technique associated with the starch resin composition.