A method of recovering lactide which includes introducing a molten resin composition that contains a polylactic acid, a depolymerization catalyst and a carrier resin into a vent chamber (3) that is maintained under a reduced pressure using a first screw conveyer passage (11) that extends in the vent chamber (3), gasifying the lactide contained in the molten resin composition, and recovering a gaseous lactide from the vent chamber, wherein a second screw conveyer passage (60) is provided under the first screw conveyer passage (11) in the vent chamber (3) to recover the carrier resin.