PURPOSE: To strengthen the structure of a molten metal discharging chamber in an aluminum filtering device where molten aluminum surface level in the molten metal discharging chamber can be kept constant.

CONSTITUTION: Corresponding to two filter cartridges in the aluminum filtering vessel, two molten metal discharging chambers 20, 21 are simply and independently set at downstream side in the aluminum filtering vessel. Two molten metal discharging chambers 20, 21 have the structure connected with a communicating tube 22 at each side part.