Resin composition and molded article

A film comprising a resin composition comprising a polylactic acid biodegradable resin (A), a polyolefin resin (B) and a dispersing agent (C), which has a sea-isle structure in which the biodegradable resin (A) is dispersed as isles in the polyolefin resin (B) existing as a sea component, wherein 1) the average dispersed particle size of the biodegradable resin (A) is 120 nm to 690 nm, the dispersing agent (C) is polyolefin-polystyrene block copolymers containing acid anhydride group, and the ration (B) is 0.05 to 0.42, and 2) the heat shrinkage rate of the film is 1.8% or less in the machine direction and is 0.6% or less in the transverse direction at a temperature of 120° C. based on JIS Z 1712.