The present invention is provided with: a primary ingot production step in which 3-20 mass% of a CaO-CaF2 flux obtained by mixing 35-95 mass% of calcium fluoride with calcium oxide, is added to a Ti-Al alloy material including a total of at least 0.1 mass% of oxygen, and at least 40 mass% of Al, and the resultant substance is melted by way of a melting method using a water-cooled copper container in an atmosphere having a pressure of 1.33 Pa or higher, and held, to produce a primary ingot; a secondary ingot production step in which the primary ingot is continuously drawn downwards while being melted by way of a melting method using a bottomless water-cooled copper casting mould in an atmosphere having a pressure of 1.33 Pa or higher, to obtain a secondary ingot Y; and a flux layer removal step in which a flux layer deposited on the surface of the secondary ingot Y is mechanically removed.