A device for producing a packaged electrode having an electrode sandwiched between a pair of separators, the device comprising: a conveyance unit configured to sequentially overlay the electrode and the pair of separators from a front end side in a conveying direction while conveying the electrode and the pair of separators in the conveying direction; and characterized by: a joining unit movable reciprocatingly in the conveying direction and having a joining head; a first joining chip attached to the joining head and configured to join lateral edges of the pair of separators together, the lateral edges being positioned in a direction intersecting the conveying direction; at least one second joining chip attached to the joining head, positioned downstream of the first joining chip in the conveying direction and configured to join the lateral edges of the pair of separators together; and a controller configured to control operations of the conveyance unit, the joining unit, the joining head, the first joining chip, and the second joining chip, wherein the controller is configured to drive the first joining chip positioned upstream to join together front ends of the lateral edges of the pair of separators being sequentially overlaid while being conveyed by the conveyance unit, before the front ends are conveyed to the second joining chip positioned downstream. a conveyance unit configured to sequentially overlay the electrode and the pair of separators from a front end side in a conveying direction while conveying the electrode and the pair of separators in the conveying direction; and characterized by: a joining unit movable reciprocatingly in the conveying direction and having a joining head; a first joining chip attached to the joining head and configured to join lateral edges of the pair of separators together, the lateral edges being positioned in a direction intersecting the conveying direction; at least one second joining chip attached to the joining head, positioned downstream of the first joining chip in the conveying direction and configured to join the lateral edges of the pair of separators together; and a controller configured to control operations of the conveyance unit, the joining unit, the joining head, the first joining chip, and the second joining chip, wherein the controller is configured to drive the first joining chip positioned upstream to join together front ends of the lateral edges of the pair of separators being sequentially overlaid while being conveyed by the conveyance unit, before the front ends are conveyed to the second joining chip positioned downstream. a joining unit movable reciprocatingly in the conveying direction and having a joining head; a first joining chip attached to the joining head and configured to join lateral edges of the pair of separators together, the lateral edges being positioned in a direction intersecting the conveying direction; at least one second joining chip attached to the joining head, positioned downstream of the first joining chip in the conveying direction and configured to join the lateral edges of the pair of separators together; and a controller configured to control operations of the conveyance unit, the joining unit, the joining head, the first joining chip, and the second joining chip, wherein the controller is configured to drive the first joining chip positioned upstream to join together front ends of the lateral edges of the pair of separators being sequentially overlaid while being conveyed by the conveyance unit, before the front ends are conveyed to the second joining chip positioned downstream.