The present invention comprising the steps of: (a) in which a plurality of plate-shaped conductors are longitudinally stacked one end portion of the coupling groove or hole in the form of conductor group laminated notching additional bond formed; Step (b) is the laminated conductor group wrapped by a fire-resistant tape; (C) is fitted to one end of the coupler and fastening the lead wire engaging portion formed in a form of a side to the other at one side of the tube, further added fastening engagement with the engagement portion; (D) a step in which the lead wire is moved to one side from the other side of the tube, coating the above-mentioned laminated conductor group is fitted on the tube; (E) step is added dismantling engagement with the engagement portion, the additional removal of notching coupled to one end of the laminated conductor group; Bus bar relates to a method comprising the. According to the invention, even if the contact between the bus bar adjacent by an external impact occurs, to block the short circuit occurs, and the fire as well as to be prevented, without causing no damage to the tubes, quickly and easily laminated conductor groups tube It was inserted in the coating using a bar that can provide high-quality bus bus bar manufacturing method and a manufacturing method thereof can be provided the bus bar.