A sandwich panel (100) comprises: a core layer (10) having a honeycomb structure; and cured products (40) of one or more layers of prepregs (20) provided on both sides of the core layer (10), wherein parts of the cured products (40) of the prepregs (20) penetrate into the core layer (10), and the number density of pinholes when observing the outermost surface of the sandwich panel (100) is 0-50/cm2.
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