There is provided a secondary battery including a case having an internal space, an electrode assembly inserted into the case and including a first electrode plate, a second electrode plate, and a separator between the first electrode plate and the second electrode plate, an electrode tab electrically connected to the electrode assembly, a cap plate sealing the case, a current collector electrically connected to the electrode tab, an electrode terminal electrically connected to the current collector and configured to pass through the cap plate to protrude toward the outside, and a connector having an end coupled to the electrode assembly and an other end coupled to the current collector.