A melt circulating drive device that is driven to agitate nonferrous metal melt present in a melt storage room storing nonferrous metal melt of a main bath, the melt circulating drive device comprising: a melt drive tank that includes a drive chamber hermetically-sealed by an upper lid, the drive chamber including an opening allowing the drive chamber to communicate with the melt storage room, and the melt drive tank storing melt, which flows from the opening, in the drive chamber; a melt drive unit that includes a permanent magnet unit that is rotated about a first up and down axis while making magnetic lines of force pass through along the up and down direction the melt present in the drive chamber of the melt drive tank, and a drive unit for the permanent magnet unit that rotates the melt, which is present in the drive chamber, about the first up and down axis by rotationally driving the permanent magnet unit; and a partition plate having an outer end being positioned in a region of the opening and an inner end being positioned in the drive chamber, a melt rotating gap being formed between the inner end and an inner surface of the drive chamber facing the inner end, the partition plate dividing the opening of the drive chamber into a first opening and a second opening positioned on both right and left sides of the partition plate, and the melt drive unit rotates the melt in order to collide with one surface of the partition plate to discharge the melt from the first opening, so as to allow external melt to be sucked into the drive chamber, in which the pressure of the melt has been reduced, from the second opening, characterized in that the melt circulating drive device is mounted on a side wall of the main bath, the melt drive unit is installed above the melt drive tank, and the partition plate is disposed upright in the drive chamber of the melt drive tank along a direction where the drive chamber and the melt storage room communicate with each other. a melt drive tank that includes a drive chamber hermetically-sealed by an upper lid, the drive chamber including an opening allowing the drive chamber to communicate with the melt storage room, and the melt drive tank storing melt, which flows from the opening, in the drive chamber; a melt drive unit that includes a permanent magnet unit that is rotated about a first up and down axis while making magnetic lines of force pass through along the up and down direction the melt present in the drive chamber of the melt drive tank, and a drive unit for the permanent magnet unit that rotates the melt, which is present in the drive chamber, about the first up and down axis by rotationally driving the permanent magnet unit; and a partition plate having an outer end being positioned in a region of the opening and an inner end being positioned in the drive chamber, a melt rotating gap being formed between the inner end and an inner surface of the drive chamber facing the inner end, the partition plate dividing the opening of the drive chamber into a first opening and a second opening positioned on both right and left sides of the partition plate, and the melt drive unit rotates the melt in order to collide with one surface of the partition plate to discharge the melt from the first opening, so as to allow external melt to be sucked into the drive chamber, in which the pressure of the melt has been reduced, from the second opening, characterized in that the melt circulating drive device is mounted on a side wall of the main bath, the melt drive unit is installed above the melt drive tank, and the partition plate is disposed upright in the drive chamber of the melt drive tank along a direction where the drive chamber and the melt storage room communicate with each other.