Provided are: a method for producing microparticles of a
polylactic acid-based resin; porous microparticles of a
polylactic acid-based resin, said microparticles having a
small particle diameter, showing a high
oil absorption ability and being appropriately
usable for
cosmetics; smooth-surfaced microparticles of a
polylactic acid-based resin, said microparticles having a
spherical form, showing a narrow particle
diameter distribution and being appropriately
usable for toners; and a cosmetic using the aforesaid microparticles of a polylactic acid-based resin. The method for producing microparticles of a polylactic acid-based resin comprises: dissolving a polylactic acid-based resin (A) and a
polymer (B), which is different from polylactic acid-based resins, in an
ether-type
organic solvent (C); applying a
shear force thereto to form an
emulsion; and then contacting the
emulsion with a poor
solvent of the polylactic acid-based resin (A). According to this production method, porous microparticles of the polylactic acid-based resin, said microparticles having a fusion
enthalpy of the polylactic acid-based resin (A) of 5 J / g or greater, having a
small particle diameter and showing a high
oil absorption ability, and smooth-surfaced microparticles of the polylactic acid-based resin, said microparticles having a fusion
enthalpy less than 5 J / g, having a
spherical form and showing a narrow particle diameter distribution, can be provided.