To provide a metal melting furnace capable of providing molten metal with desired compositions by using as raw material one or more materials of conventional standard materials, return materials or pure metallic materials and accepting chips as the raw material with compositions corresponding to the pure metallic materials or the standard materials and to produce molded products such as cast products, die casting products with excellent mechanical properties without defects by feeding the low-cost and quality-stable molten metal to a molding device in the rear step by the metal melting furnace at a low cost.

This continuous type metal melting furnace has a blending function capable of providing the molten metal A with desired compositions by melting at least two kinds of pure metallic materials contained in a pure metallic material group Xn constituted by an alloy material A and/or plural kinds of pure metallic materials.