The method for collecting lactide according to the present invention uses a vent chamber 3 in which a first screw transport path 11 is extended; utilizes the first screw transport path 11 to introduce a molten resin composition containing a polylactic acid, a depolymerization catalyst, and a carrier resin into the vent chamber 3, which has been retained at a reduced pressure; gasifies lactide contained in the molten resin composition; and collects gasified lactide from the vent chamber. The collection method for lactide is characterized in that a second screw transport path 60 for collecting the carrier resin is provided under the first screw transport path 11 inside the vent chamber 3.