A metal capacitor in which an electric conductivity is significantly improved by applying a metal material for an electrolyte and a manufacturing method thereof is provided. The metal capacitor includes a metal member comprising a through-hole forming portion where a plurality of through-holes is formed, an electrode withdrawing portion and a sealing portion formed on the through-hole forming portion; a metal oxide layer being formed on the metal member; an insulating layer being formed on the metal member to externally expose the electrode withdrawing portion and the plurality of through-holes; a main electrode layer being formed on the metal oxide layer that is formed on the through-hole forming portion of the metal member, to fill the plurality of through-holes, wherein lead terminals are respectively connected in the electrode withdrawing portion of the metal member and the main electrode layer.