PURPOSE: A secondary battery is provided to form a bent part while ensuring the sealability of a battery by combining an exterior material by using bonding or sealing with two kinds of different bonding strengths. CONSTITUTION: A secondary battery(100) comprises: a metallic can(110) which comprises an open part and an acceptance part in which an electrode assembly and electrolyte are accepted together; a metallic cap(120) which is located in the opening part of the can to seal the can; a first sealing part formed between the flange(113) of the can and the flange(123) of the cap to couple the can and cap; and a second sealing part formed between the flanges of the can and cap to couple the can and the cap. The bonding strength of the first sealing part and the second sealing part are different to each other.
