To provide a vacuum furnace in which maintenance frequency can be decreased as much as possible by preventing scattering of wax, metal vapor, or the like, while ensuring efficient exhaustion.

An enclosed container V comprises a tray 3 for carrying an article M, and a semi-container cover 4 being applied to the tray 3. The tray 3 is provided with an exhaust opening 31 which is interconnected with an opening at the forward end 51 of an evacuation pipe 5 by advancing it toward the enclosed container V through a drive cylinder 56. The cover 4 is provided with a gas conduction hole 42 for feeding gas in the furnace into the enclosed container V.