A resin sheet is made of a resin composition containing a (A) heat-curable component. The (A) heat-curable component contains a (A1) first maleimide resin. The (A1) first maleimide resin is a maleimide resin having two or more maleimide groups in one molecule, at least a pair of the maleimide groups being bonded by a binding group whose main chain includes four or more methylene groups.