A manufacturing device for manufacturing a battery case in which a storage part for mounting an electrode assembly for a secondary battery is formed on a laminate sheet, the manufacturing device comprising: a first mold including a first space part having a shape corresponding to the storage part formed therein; a second mold including a second space part having a shape corresponding to the storage part and a through-hole communicating with the second space part formed therein, and coupled to the first mold with the laminate sheet interposed therebetween; and an air pressure regulator connected to the through-hole and adapted to decrease an air pressure of the second space part through the through-hole to stretch and modify the laminate sheet into a shape corresponding to the first space part or the second space part, the first mold and the second mold being coupled by mechanical fastening means so as to isolate the first space part and the second space part from the outside, and wherein: the air pressure regulator is adapted for decreasing an air pressure of the second space part through the through-hole, the laminate sheet is modified into a shape corresponding to the second space part while being stretched in a direction of the second space part in response to the decrease in pressure of the second space part, a vertical cross-sectional area of the through-hole through which air flows has a size of 0.01% to 5% compared to a total area of the laminate sheet positioned in the second space part before the decrease in pressure, a coating layer for reducing frictional force with the laminate sheet is added to an inner surface of the first and second space parts (112, 122), and the coating layer is a Teflon resin. a first mold including a first space part having a shape corresponding to the storage part formed therein; a second mold including a second space part having a shape corresponding to the storage part and a through-hole communicating with the second space part formed therein, and coupled to the first mold with the laminate sheet interposed therebetween; and an air pressure regulator connected to the through-hole and adapted to decrease an air pressure of the second space part through the through-hole to stretch and modify the laminate sheet into a shape corresponding to the first space part or the second space part, the first mold and the second mold being coupled by mechanical fastening means so as to isolate the first space part and the second space part from the outside, and wherein: the air pressure regulator is adapted for decreasing an air pressure of the second space part through the through-hole, the laminate sheet is modified into a shape corresponding to the second space part while being stretched in a direction of the second space part in response to the decrease in pressure of the second space part, a vertical cross-sectional area of the through-hole through which air flows has a size of 0.01% to 5% compared to a total area of the laminate sheet positioned in the second space part before the decrease in pressure, a coating layer for reducing frictional force with the laminate sheet is added to an inner surface of the first and second space parts (112, 122), and the coating layer is a Teflon resin.