A secondary battery including an electrode assembly; a can accommodating the electrode assembly; a cap assembly sealing the can; a first insulation member on a side of the electrode assembly, the first insulation member having an opening exposing at least a portion of a bottom surface of the electrode assembly; and a second insulation member on a bottom of the can and facing the bottom surface of the electrode assembly, the second insulation member having an area corresponding to an area of the opening in the first insulation member.