Resin composition and method for producing same

A resin composition comprising:

• 50 to 98 parts by mass of modified starch (A);
• 2 to 50 parts by mass of polyvinyl alcohol (B);
• and
• 0.01 to 0.15 parts by mass of a compound represented by formula (1):
• (wherein R1 represents an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms;
• R2 to R5 independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, a hydroxyl group, or an alkoxy group having 1 to 12 carbon atoms;
• and R6 represents a hydroxyl group, or an alkoxy group having 1 to 12 carbon atoms)
• or a salt thereof (C),
• wherein the total content of the components (A), (B) and (C) is 100 parts by mass, and the average amylose content in the modified starch (A) is 50% by mass or more.