An molten metal stirring device is provided, including a main bath that includes a furnace main body including a storage chamber; and a stirring unit that drives and stirs the molten metal stored in the furnace main body, the stirring unit including a passage member that includes a molten metal passage, the rotating-shifting magnetic field unit main body including a permanent magnet and being provided outside the passage member, the furnace main body including a molten metal outlet and inlet formed in a side wall and in communication with each other, at least a pair of electrodes are provided in the molten metal passage, and molten metal present in the molten metal passage is driven toward the molten metal outlet by a resultant driving force of first and second electromagnetic forces according to Fleming's rule.