a biaxially oriented multilayered container consisting of a body portion and a mouth portion . the body portion comprises one or more layers of a thermoplastic gas - barrier resin b and layers of a thermoplastic resin a other than the resin b which are larger in number than the resin b layers by 1 , the resin a and b layers being laminated alternately , and at least the open end part of said mouth portion is composed of a single layer of the resin a . as a characteristic feature , a coarsely mixed resin layer of resins a and b in which the proportion of resin particles having a long diameter of not more than 10 μm is not more than 10 % exists in at least one of the boundaries between the resin a and b layers .