Polylactic acid composition and method for producing same

Provided are: a polylactic acid composition having extremely good molding processability; and a method for producing the same.  A polylactic acid composition comprising poly-L-lactic acid and a polylactic acid block copolymer in which the mass ratio of an L-lactic acid unit to a D-lactic acid unit is from 50/50 to 91/9 (L-lactic acid unit/D-lactic acid unit); a polylactic acid composition comprising poly-D-lactic acid and a polylactic acid block copolymer in which the mass ratio of an L-lactic acid unit to a D-lactic acid unit is from 49/51 to 9/91 (L-lactic acid unit/D-lactic acid unit); and a method for producing the same.