CAST PRODUCT HAVING ALUMINA BARRIER LAYER

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To provide a cast product having an alumina barrier layer and method for producing the same. A cast product having an alumina barrier layer of the present invention is a cast product in which an alumina barrier layer containing Al2O3 is formed on the surface of a cast body, and the cast body contains C : 0.3 mass % to 0.7 mass %, Si : 0.1 mass % to 1.5 mass %, Mn : 0.1 mass % to 3 mass %, Cr : 15 mass % to 40 mass %, Ni : 20 mass % to 55 mass %, Al : 2 mass % to 4 mass %, rare earth element : 0.005 mass % to 0.4 mass %, W : 0.5 mass % to 5 mass % and/or Mo : 0.1 mass % to 3 mass %, and 25 mass % or more of Fe in the remainder and an inevitable impurity, and 80 mass % or more of the rare earth element is La.