Method for preserving food sterilized by heating

The invention provides a method for preserving food to be sterilized by heating, which comprises sealing the food by using a multilayer container and a cap part and sterilizing the food by heating at 80 DEG C. or higher, wherein the container has a layered structure having three or more layers in which a layer comprising polypropylene as the main component, an adhesive layer comprising an adhesive thermoplastic resin and a gas barrier layer comprising a polyamide resin having substantially no hydroxyl group are laminated in this order, and the cap part has a gas barrier layer.