Multilayer Structure and Method for Producing Same, and Protective Sheet and Electronic Device which Utilize Same

A multilayer structure comprising:

• a laminate comprising a base (X) and at least two layers (Y), the layers (Y) being provided on both faces of the base (X);
• and
• layers (Z) comprising a thermoplastic resin as a principal component and being laminated via each of adhesive layers (I) on both faces of the laminate, wherein
• the at least two layers (Y) comprise a reaction product (D) of an inorganic phosphorus compound (BI) with a metal oxide (A) comprising an aluminum atom,
• a thickness of the base (X) is 5 μm or more and 100 μm or less,
• a thickness of each layer of the layers (Z) is 5 μm or more and 100 μm or less,
• a total thickness of all layers is 15 μm or more and 120 μm or less,
• the at least two layers (Y) may be identical to or different from each other,
• the adhesive layers (I) provided on both faces of the laminate may be identical to or different from each other,
• the layers (Z) provided on both faces of the laminate may be identical to or different from each other, and
• a moisture permeability measured in accordance with ISO15106-5 is 1.0×1031 2 g/m2·day or less.