Provided is a technique capable of improving the production efficiency of sandwich panels. A method for manufacturing a sandwich panel 100 includes the steps of: Preparing a plurality of resin sheets a, a sheet-like base material b, and a sheet-like core layer c having a honeycomb structure, A step of arranging a resin sheet A1, a sheet-like base material b, and a resin sheet A2 in this order on each surface of the core layer c, And a step of collectively laminating the resin sheet a and the sheet-like base material b by heating and pressurizing treatment. Figure 1

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