Provided is a novel method for manufacturing a pre-preg for a sandwich panel. A method of manufacturing a prepreg 10 for a sandwich panel includes the steps of: Preparing a plurality of resin sheets a and sheet-like base materials b, respectively; holding the resin sheet a in a state of holding the sheet-like base materials b therebetween, A step of laminating the resin sheet (a) and the sheet-like base material (b) on both surfaces of the sheet-like base material (b), and a step of integrating the laminated resin sheet (a) and the sheet-like base material (b) by heat treatment. Figure 1

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