Multilayer container, method for manufacturing same, and method for manufacturing reclaimed polyester

A method for manufacturing a multilayer container comprising:

• a polyester layer containing a polyester resin (X);
• and
• a polyamide layer containing a polyamide resin (Y) and a yellowing inhibitor (A);
• a content of the polyamide resin (Y) being from 0.05 to 7.0 mass % relative to a total amount of all polyamide layers and all polyester layers;
• and
• a content of the yellowing inhibitor (A) being from 1 to 30 ppm relative to the total amount of all polyamide layers and all polyester layers;
• and
• the manufacturing method comprising:
• a step 1 of mixing the polyamide resin (Y) and the yellowing inhibitor (A) to prepare a polyamide resin mixture;
• a step 2 of co-injection molding the polyamide resin mixture and a polyester resin composition containing the polyester resin (X), and thereby obtaining a multilayer preform;
• and
• a step 3 of blow molding the multilayer preform.