A preform layered body (100, 300) for forming a layered container (1, 200, 200A) comprising a cylindrical container body (3, 203), a container bottom (2, 202) closing a lower end of the container body, and a container mouth (4, 204) formed at an upper end of the container body by biaxial stretch-blow forming, the preform layered body comprising: an inner-layer-use preform (110, 310) for forming an inner layer of the layered container; an outer-layer-use preform (120, 320) for forming an outer layer of the layered container; and a tag (30, 230), wherein the inner-layer-use preform is disposed inside the outer-layer-use preform, the inner-layer-use preform includes an inner-layer-use bottom (112, 312) and an inner-layer-use body (113, 313) subjected to biaxial stretch-blow forming to form a bottom inner layer part (12, 212) and a body inner layer part (13, 213) of the layered container, and an inner-layer-use mouth (114, 314) that remains as a mouth inner layer part (14, 214) of the layered container without being subjected to biaxial stretch-blow forming, the outer-layer-use preform includes an outer-layer-use bottom (122, 322) and an outer-layer-use body (123, 323) subjected to biaxial stretch-blow forming to form a bottom outer layer part (22, 222) and a body outer layer part (23, 223) of the layered container, and an outer-layer-use mouth (124, 324) that remains as a mouth outer layer part (24, 224) of the layered container without being subjected to stretch-blow forming, the preform layered body being characterized in further comprising: a male threaded part (5, 105, 205, 305) for attaching a cap, and an annular support ring (6, 106, 206, 306) located between the male threaded part and the outer-layer-use body, that are integrally formed on the outer peripheral surface of the mouth outer layer part of the outer-layer-use preform, and in that the tag is disposed between the outer-layer-use mouth and the inner-layer-use mouth. an inner-layer-use preform (110, 310) for forming an inner layer of the layered container; an outer-layer-use preform (120, 320) for forming an outer layer of the layered container; and a tag (30, 230), wherein the inner-layer-use preform is disposed inside the outer-layer-use preform, the inner-layer-use preform includes an inner-layer-use bottom (112, 312) and an inner-layer-use body (113, 313) subjected to biaxial stretch-blow forming to form a bottom inner layer part (12, 212) and a body inner layer part (13, 213) of the layered container, and an inner-layer-use mouth (114, 314) that remains as a mouth inner layer part (14, 214) of the layered container without being subjected to biaxial stretch-blow forming, the outer-layer-use preform includes an outer-layer-use bottom (122, 322) and an outer-layer-use body (123, 323) subjected to biaxial stretch-blow forming to form a bottom outer layer part (22, 222) and a body outer layer part (23, 223) of the layered container, and an outer-layer-use mouth (124, 324) that remains as a mouth outer layer part (24, 224) of the layered container without being subjected to stretch-blow forming, the preform layered body being characterized in further comprising: a male threaded part (5, 105, 205, 305) for attaching a cap, and an annular support ring (6, 106, 206, 306) located between the male threaded part and the outer-layer-use body, that are integrally formed on the outer peripheral surface of the mouth outer layer part of the outer-layer-use preform, and in that the tag is disposed between the outer-layer-use mouth and the inner-layer-use mouth.