The present invention is to provide a method for producing a core-shell catalyst for fuel cells, which is configured to facilitate shell deposition by, in the production of the core-shell catalyst for fuel cells, decreasing an oxidation-reduction potential applied for shell deposition lower than ever before. Disclosed is a method for producing a core-shell catalyst for fuel cells, wherein the method comprises: a first refluxing step of refluxing a mixture A containing a core fine particle-supported carbon, alcohol and water; a mixing step of preparing a mixture B by, after the first refluxing step, mixing the mixture A having a temperature that is lower than that in the first refluxing step with a shell material; and a second refluxing step of refluxing the mixture B.