The method includes a step of aligning and laminating enlarged iron core pieces including iron core pieces and dummy piece parts and forming a composite laminated iron core integrally including a dummy laminated part with the dummy piece parts laminated and a laminated iron core, a step of placing and positioning the composite laminated iron core on a jig and removing the dummy laminated part, and a step of mutually bonding the laminated iron core body with the dummy laminated part removed to form the laminated iron core.