To provide an immersion tube burner comprising an immersion tube which does not suffer oxidization loss and wear and is not damaged by thermal stress ascribed to temperature difference, and having good durability.

An immersion tube burner has an arrangement in which an immersion tube 2 is immersed in molten non-ferrous metal in a metal furnace 7, the immersion tube 2 being incorporated with a combustion cylinder 3 in such a condition that a channel for discharging combustion gas is provided between the cylinder 3 and the immersion tube 2, and in which a burner 4 is combusted in the cylinder 3 to heat the non-ferrous metal for melting and holding. In the burner, heat insulating members 5, which are hardly oxidized, are disposed in face to face at given upper and lower levels from a bath surface S of the molten non-ferrous metal and on the inner wall surface of the immersion tube 2. The insulating member 5 is composed of a ceramic cylinder 5a made by forming ceramic fibers in a cylindrical shape and a ceramic rope 5b made by forming the ceramic fibers in a shape of rope and winding the same in a cylindrical shape.