To provide a vertical sinking type axial flow pump in which an installation area is narrow, preheating time is unnecessary, and solidification of molten metal in starting is prevented in the vertical sinking type pump used for changing the molten metal of a ready furnace, a holding furnace, or a smelting furnace, or disposing of residual molten metal.

A cylindrical casing 2 is fixed to the lower end of a thin molten metal pumping tube 1 having a discharge port 1a, the upper end part of a hollow shaft 4 is connected to a motor 8, the hollow shaft 4 is inserted into the thin molten metal pumping tube 1, and an axial flow type impeller 3 is fixed to the lower end of the hollow shaft 4 and installed within the casing 2.