To provide an apparatus and a method which can stably purify molten metal containing inclusions at high purification efficiency.

To the molten metal, which contains inclusions, flowing through a molten metal flow passage 10, electrodes 12a, 12b are arranged on the upstream side and the downstream side, an electric field is acted in such a manner that the direction of the electric field is made coincident with the direction of the flow of the molten metal, the molten metal flow passage is composed so as to be orthogonal to the direction of the magnetic field, and a magnetic field is acted so as to be made orthogonal to the direction of the flow of the molten metal. The flow passage comprises at least one wind spiral part 10a, and is composed in such a manner that the direction of the core of the spiral part is made coincident with the direction of the magnetic field, and the direction of the core of the spiral part is composed so as to be coincident with the direction of gravity. Alternatively, the flow passage comprises at least one circular arc part and is composed in such a manner that the normal vector of the curvature radius vector in the circular arc part is made coincident with the direction of the magnetic field. In the pair of electrodes, the electrode on the downstream side is arranged on branched part piping provided at the outlet side of the molten metal flow passage and also at a region crossed with the extension of the central line of the flow passage piping.