Secondary battery and case, and method for manufacturing same

Disclosed herein are a case for secondary battery, a secondary battery including the case, and a method for manufacturing the case for the secondary battery. According to the present disclosure, a gas discharge device can be formed in the case for a secondary battery. The case may include a recess part with a cutoff area. The gas discharge device can include a passage through which a gas is discharged through the cutoff area of the recess part when a pressure of the empty space in the body part exceeds a predetermined value.