A preform, a method of producing the preform, and a container obtained by draw-forming the preform. The preform has at least a layer of a polyester resin and is formed by the compression-forming, wherein the time is not shorter than 300 seconds before a calorific value of isothermal crystallization of the layer of the polyester resin at 210° C. reaches a maximum value. The preform is provided suppressing the thermal decomposition of the resin at the time of forming the preform, and effectively suppressing a drop in the inherent viscosity and the formation of the acetaldehyde. Further, a biaxially drawn container is provided having excellent mechanical strength and flavor-retaining property.