An apparatus for melting and forming metal in a vacuum environment, comprising: a mold having a mold cavity for forming metal; a hollow melting sleeve adapted to melt metal loaded thereinto, the melting sleeve being disposed below and communicating with the mold cavity; a pressing plunger that is adapted to move forward within the melting sleeve to push and fill the molten metal into the mold cavity; a sleeve support provided to support the lower end of the melting sleeve, the sleeve support having a hole communicating with the interior of the melting sleeve, the hole extending through the sleeve support; a closing flange that is fixed to close the lower end of the hole formed in the sleeve support, wherein a plunger rod extends through the closing flange; a space formed in a rear of the pressing plunger, the space being formed such that the pressing plunger does not touch the closing flange even if the pressing plunger moves backwards to its rearmost position, the space communicating with the melting sleeve such that metal debris dropping through a gap between the pressing plunger and an inner wall surface of the melting sleeve accumulates in the space during a process of forming the metal; wherein an interior of the melting sleeve, an interior of the mold cavity and the space are sealed from air; and an exhaust unit having a first exhaust pipe and a second exhaust pipe, the first exhaust pipe communicating with the mold cavity to draw air from the interior of the mold cavity and the interior of the melting sleeve, and the second exhaust pipe communicating with the space to draw air from the space, wherein the exhaust unit is adapted to draw air simultaneously from the interior of the mold cavity, the interior of the melting sleeve and the space through the first exhaust pipe and the second exhaust pipe. a mold having a mold cavity for forming metal; a hollow melting sleeve adapted to melt metal loaded thereinto, the melting sleeve being disposed below and communicating with the mold cavity; a pressing plunger that is adapted to move forward within the melting sleeve to push and fill the molten metal into the mold cavity; a sleeve support provided to support the lower end of the melting sleeve, the sleeve support having a hole communicating with the interior of the melting sleeve, the hole extending through the sleeve support; a closing flange that is fixed to close the lower end of the hole formed in the sleeve support, wherein a plunger rod extends through the closing flange; a space formed in a rear of the pressing plunger, the space being formed such that the pressing plunger does not touch the closing flange even if the pressing plunger moves backwards to its rearmost position, the space communicating with the melting sleeve such that metal debris dropping through a gap between the pressing plunger and an inner wall surface of the melting sleeve accumulates in the space during a process of forming the metal; wherein an interior of the melting sleeve, an interior of the mold cavity and the space are sealed from air; and an exhaust unit having a first exhaust pipe and a second exhaust pipe, the first exhaust pipe communicating with the mold cavity to draw air from the interior of the mold cavity and the interior of the melting sleeve, and the second exhaust pipe communicating with the space to draw air from the space, wherein the exhaust unit is adapted to draw air simultaneously from the interior of the mold cavity, the interior of the melting sleeve and the space through the first exhaust pipe and the second exhaust pipe.