NOVELTY - A multilayered structure comprises substrate (X) and layer (Y) layered on the substrate (X). The layer (Y) comprises metal oxide, phosphorus compound containing a site which is reactable with the metal oxide and positive ions having ionic valency of 1-3. The ratio of number-of-moles of the metal atom in the metal oxide and number-of-moles of the phosphorus atom derived from the phosphorus compound (B) in the layer (Y) is 0.8-4.5.    USE - Multilayered structure is vacuum-insulating product, protection sheet for electronic device e.g. photoelectric conversion apparatus, information display apparatus and illuminating device and packaging material e.g. cover material for vertical bag filling seal bag, vacuum-packaging bag, lamination tube container, infusion solution bag, paper container, strip tape, in-mold label container and pouch (all claimed) for foodstuff, medicine, medical equipment, industrial material and garment. Uses include but are not limited to diaphragm and sealing film for fuel cell, substrate film for liquid crystal device, substrate film for organic electroluminescent device, substrate film for electronic paper, film for plasma display device, film for LED, solar cell backsheet, protective film for solar cell and component for optical communication device.    ADVANTAGE - The multilayered structure is manufactured by a simple process, and has excellent gas-barrier property, water vapor-barrier property and tolerance with respect to a physical stress.    DETAILED DESCRIPTION - A multilayered structure comprises substrate (X) and layer (Y) layered on the substrate (X). The layer (Y) comprises metal oxide, phosphorus compound containing a site which is reactable with the metal oxide and positive ions having ionic valency of 1-3. The ratio of number-of-moles of the metal atom in the metal oxide and number-of-moles of the phosphorus atom derived from the phosphorus compound (B) in the layer (Y) is 0.8-4.5. The product of ionic valency with respect to ratio of number-of-moles of the metal atom in the metal oxide and number-of-moles of the phosphorus atom derived from the phosphorus compound (B) in the layer (Y) is 0.001-0.60. INDEPENDENT CLAIMS are included for the following:    (1) manufacture of multilayered structure; and    (2) vacuum-insulating product.