A method for manufacturing a laminated iron core includes sequentially performing multiple types of machining on designated portions of a workpiece from which iron core pieces are to be punched out, determining whether standard machining has been performed on each designated portion, forming core piece blocks by stacking the iron core pieces to have a specified stacking height, and forming, when it is determined that the standard machining has not been performed on any of the designated portions through the determining whether standard machining has been performed, a dummy block by stacking the iron core pieces that include the iron core piece formed by punching out the designated portion not having been subjected to the standard machining, the formed dummy block having a stacking height different from the specified stacking height.