To provide a lead-in wire for a vessel and the vessel enhancing the quality and a yield of a product and reducing a cost by selecting a material of an outside lead-in wire being connected to a sealing wire by welding and the thickness of a copper coating.

This lead-in wire 1 for the vessel is equipped with the sealing wire 2; an inside conductor 3 welded to one end part of the sealing wire 2; and an outside lead-in wire 4 welded to the other end of the sealing wire 2 in which a 1-5 μm copper coating layer 4B is formed on the surface of a core wire 4A containing iron as the main component, and the vessel L uses the lead-in wire 1.