A secondary battery including an electrode assembly; a case containing the electrode assembly; a cap plate sealing an opening of the case; a terminal plate electrically connected to the electrode assembly; an electrode terminal electrically connected to the terminal plate; and an insulation layer between the cap plate and the terminal plate and electrically insulating the cap plate and the terminal plate from each other, and the terminal plate includes a first metal layer connected to the electrode terminal, and a second metal layer on the first metal layer, the second metal layer being between the first metal layer and the insulation layer.