Metal removal method and metal recovery method

A metal removal method comprising a processing step of forming a molten salt layer in contact with an aluminum alloy melt containing Mg which covers at least a part of the surface of the aluminum alloy melt,

• the molten salt layer containing a specific halogen element that is one or more of Cl or Br and a specific metal element that is one or more of Cu or Mn,
• the metal removal method further comprising removing Mg by taking in Mg from an aluminum alloy melt side to a molten salt layer side, and
• disposing a conductor that bridges the aluminum alloy melt and the molten salt layer such that at least a conductive portion of the conductor comes into contact with the aluminum alloy melt,
• wherein the conductor is selected from (i) a conductive wire, (ii) a container body that holds the Al alloy melt and the molten salt layer, and (iii) a conductive material disposed on the inner wall of the container body.