A manufacturing method for a cast bar and tube by using a manufacturing device (100, 200, 300) for the cast bar and tube, comprising: a molten metal furnace for holding molten metal as a dissolved casting material; a hollow tube (20, 120, 220) including a penetrating part of molten metal for penetrating molten metal and being freely inserted into and withdrawn from the molten metal furnace; a depressurization device to generate a negative pressure; a connection member of connecting the hollow tube to the depressurization device; and an open/close type valve member installed on the connection member, wherein the penetrating part (23, 123, 323) of molten metal is depressurized by switching the valve member to the closed state to reduce the pressure in the side of the depressurization device from the valve member using the depressurization device and inserting an opening (25, 125a, 125b) of the hollow tube (20, 120, 220) into molten metal which is held by the molten metal furnace as well as by switching the valve member to the open state, thereby penetrating molten metal into the penetrating part of molten metal under reduced pressure, the penetrating part of molten metal is filled with molten metal by penetrated molten metal, and filled molten metal is solidified, the manufacturing method comprising: heating the hollow tube (20, 120, 220), after the vicinity of an opening of the hollow tube (20, 120, 220) is heated in the heating process, the opening of the hollow tube (20, 120, 220) is inserted into molten metal which is held by the molten metal furnace, cooling the hollow tube (20, 120, 220) as molten metal starts to penetrate into the penetrating part (23, 123, 323) of molten metal; characterized in that a shape of the solidified part is the cast bar and tube (20, 120, 220) made of magnesium alloy; the manufacturing method further comprises between the heating of the hollow tube (20, 120, 220) and the cooling of the hollow tube (20, 120, 220) applying vibration to the hollow tube (20, 120, 220) to penetrate molten metal into the penetrating part (23, 123, 323) of molten metal until completing solidification, wherein vibration is applied by a type of enforced vibration in which physical vibration is externally applied, a type in which vibration is applied with ultrasound wave or a type in which vibration is applied with electromagnetic induction. a molten metal furnace for holding molten metal as a dissolved casting material; a hollow tube (20, 120, 220) including a penetrating part of molten metal for penetrating molten metal and being freely inserted into and withdrawn from the molten metal furnace; a depressurization device to generate a negative pressure; a connection member of connecting the hollow tube to the depressurization device; and an open/close type valve member installed on the connection member, wherein the penetrating part (23, 123, 323) of molten metal is depressurized by switching the valve member to the closed state to reduce the pressure in the side of the depressurization device from the valve member using the depressurization device and inserting an opening (25, 125a, 125b) of the hollow tube (20, 120, 220) into molten metal which is held by the molten metal furnace as well as by switching the valve member to the open state, thereby penetrating molten metal into the penetrating part of molten metal under reduced pressure, the penetrating part of molten metal is filled with molten metal by penetrated molten metal, and filled molten metal is solidified, the manufacturing method comprising: heating the hollow tube (20, 120, 220), after the vicinity of an opening of the hollow tube (20, 120, 220) is heated in the heating process, the opening of the hollow tube (20, 120, 220) is inserted into molten metal which is held by the molten metal furnace, cooling the hollow tube (20, 120, 220) as molten metal starts to penetrate into the penetrating part (23, 123, 323) of molten metal; characterized in that a shape of the solidified part is the cast bar and tube (20, 120, 220) made of magnesium alloy; the manufacturing method further comprises between the heating of the hollow tube (20, 120, 220) and the cooling of the hollow tube (20, 120, 220) applying vibration to the hollow tube (20, 120, 220) to penetrate molten metal into the penetrating part (23, 123, 323) of molten metal until completing solidification, wherein vibration is applied by a type of enforced vibration in which physical vibration is externally applied, a type in which vibration is applied with ultrasound wave or a type in which vibration is applied with electromagnetic induction. heating the hollow tube (20, 120, 220), after the vicinity of an opening of the hollow tube (20, 120, 220) is heated in the heating process, the opening of the hollow tube (20, 120, 220) is inserted into molten metal which is held by the molten metal furnace, cooling the hollow tube (20, 120, 220) as molten metal starts to penetrate into the penetrating part (23, 123, 323) of molten metal; characterized in that a shape of the solidified part is the cast bar and tube (20, 120, 220) made of magnesium alloy; the manufacturing method further comprises between the heating of the hollow tube (20, 120, 220) and the cooling of the hollow tube (20, 120, 220) applying vibration to the hollow tube (20, 120, 220) to penetrate molten metal into the penetrating part (23, 123, 323) of molten metal until completing solidification, wherein vibration is applied by a type of enforced vibration in which physical vibration is externally applied, a type in which vibration is applied with ultrasound wave or a type in which vibration is applied with electromagnetic induction.