A method for promoting crystallization of a biodegradable resin composition, including the step of melt-kneading a raw material containing ethylenebis 12-hydroxystearic amide having an amine value of 1.0 mg KOH/g or less and a biodegradable resin. Since the biodegradable resin composition obtainable by the method for promoting crystallization of the present invention has favorable crystallization velocity, a time period required upon molding the composition is shortened, whereby a molded article can be produced productively. The biodegradable resin composition can be suitably used in, for example, in various industrial applications, such as daily sundries, household electric appliance parts, and automobile parts.