the present invention provides a novel biodegradable polymer compositions effecting superiority in elongation at break , izod impact strength and mold releasability which has not been obtained before the past and provides a biodegradable shrink film exceling in transparency , strength , flexibility , mold releasability and shrinkability by applying the biodegradable polymer composition to the shrink film . thus , the biodegradable polymer compositions are provided which comprise as a main component a mixture of two or more of polylactic acids , glycol / aliphatic dicarboxylic acid copolymers and polycaprolactones and these biodegradable polymer compositions are applied to shrink films .