A stacking apparatus comprising: a cutting unit of an electrode; a cylindrical rotary conveyance unit (310, 320) holding a separator of predetermined shape on an outer circumferential surface thereof and rotating to covey the separator; and an electrode conveyance unit conveying the electrode of predetermined shape in a tangential direction of the rotary conveyance unit so that the electrode overlaps the separator; and a weld unit arranged on each side of the rotary conveyance unit (310, 320), wherein: the outer circumferential surface of the rotary conveyance unit (310, 320) is defined by a suction area that is for drawing the separator by suction and is positioned on an upstream side of a rotation direction of the rotary conveyance unit (310, 320) with respect to a location to which the electrode is conveyed by the electrode conveyance unit, and a non-suction area that is for removing the separator and is positioned on a downstream side of the rotation direction of the rotary conveyance unit (310, 320) with respect to the location to which the electrode is conveyed; the outer circumferential surface rotates relative to the suction area and non-suction area; the stacking apparatus draws the separator by suction to the outer circumferential surface in the suction area, rotates the outer circumferential surface to convey the separator to the non-suction area, removes the separator from the outer circumferential surface, and transfers the separator to the electrode, thereby gradually stacking the separator on the electrode from a downstream side of the rotation direction, wherein: the rotary conveyance unit (310, 320) includes: a rotatable cylindrical rotor having air holes in the outer circumferential surface thereof; and an internal structure arranged inside the cylindrical rotor and non-rotatably defining the suction area and non-suction area for the outer circumferential surface of the cylindrical rotor through the air holes; and the internal structure includes a negative pressure chamber that is isolated from outside thereof by an inner circumferential surface of the rotary conveyance unit (310, 320), not rotatable, connected to a negative pressure supply device, having a pressure adjusting valve, and defines the suction area. a cutting unit of an electrode; a cylindrical rotary conveyance unit (310, 320) holding a separator of predetermined shape on an outer circumferential surface thereof and rotating to covey the separator; and an electrode conveyance unit conveying the electrode of predetermined shape in a tangential direction of the rotary conveyance unit so that the electrode overlaps the separator; and the outer circumferential surface of the rotary conveyance unit (310, 320) is defined by a suction area that is for drawing the separator by suction and is positioned on an upstream side of a rotation direction of the rotary conveyance unit (310, 320) with respect to a location to which the electrode is conveyed by the electrode conveyance unit, and a non-suction area that is for removing the separator and is positioned on a downstream side of the rotation direction of the rotary conveyance unit (310, 320) with respect to the location to which the electrode is conveyed; a suction area that is for drawing the separator by suction and is positioned on an upstream side of a rotation direction of the rotary conveyance unit (310, 320) with respect to a location to which the electrode is conveyed by the electrode conveyance unit, and a non-suction area that is for removing the separator and is positioned on a downstream side of the rotation direction of the rotary conveyance unit (310, 320) with respect to the location to which the electrode is conveyed; the outer circumferential surface rotates relative to the suction area and non-suction area; the stacking apparatus draws the separator by suction to the outer circumferential surface in the suction area, rotates the outer circumferential surface to convey the separator to the non-suction area, removes the separator from the outer circumferential surface, and transfers the separator to the electrode, thereby gradually stacking the separator on the electrode from a downstream side of the rotation direction, wherein: the rotary conveyance unit (310, 320) includes: a rotatable cylindrical rotor having air holes in the outer circumferential surface thereof; and an internal structure arranged inside the cylindrical rotor and non-rotatably defining the suction area and non-suction area for the outer circumferential surface of the cylindrical rotor through the air holes; and the internal structure includes a negative pressure chamber that is isolated from outside thereof by an inner circumferential surface of the rotary conveyance unit (310, 320), not rotatable, connected to a negative pressure supply device, having a pressure adjusting valve, and defines the suction area. a rotatable cylindrical rotor having air holes in the outer circumferential surface thereof; and an internal structure arranged inside the cylindrical rotor and non-rotatably defining the suction area and non-suction area for the outer circumferential surface of the cylindrical rotor through the air holes; and the internal structure includes a negative pressure chamber that is isolated from outside thereof by an inner circumferential surface of the rotary conveyance unit (310, 320), not rotatable, connected to a negative pressure supply device, having a pressure adjusting valve, and defines the suction area.