The present invention relates to a secondary battery. The secondary battery comprises an electrode assembly, which comprises: a first electrode in which a first notching part is provided; a second electrode in which a second notching part is provided; a first separator interposed between the first electrode and the second electrode; and a second separator disposed on a lower portion of the second electrode, wherein the electrode assembly is folded in a width direction in a state in which the first electrode, the first separator, the second electrode, and the second separator are sequentially stacked and folded and bent through the first and second notching parts.