The present invention relates to an apparatus for manufacturing a rechargeable battery case, the apparatus comprising: a punch which presses an object; a die which comprises an extrusion part for extruding the pressed object, wherein, when the punch presses the object such that the object enters the extrusion part, the die is elastically deformed so that the width of the extrusion part is increased, and when the punch continues to press the object such that the object is separated from the extrusion part, the die is elastically deformed so that the width of the extrusion part is restored to an initial value; and a knockout unit which is raised through the extrusion part of the die, has the object seated thereon, raises or lowers the object, and raises the object when the object interferes with the die such that the punch and the object are separated from each other.