The invention provides a laminated iron core, a method for manufacturing the laminated iron core, and a punch for caulking formation used in the method. Solid stack riveting stack can also be carried out by means of thin plates of thickness of 0.2mm or less. The laminated core (10) is formed with a plurality of iron chips (12) punched out from a sheet (14) having a thickness of 0.2 mm or less; one end portion is continuous, the other parts are separated and tilted; the overlapping pieces (15,16) of the adjacent iron chips(12) are fitted into the opening portions (19, 20) to connect the plurality of iron chips (11,12); the overlapping rivet protrusions (15,16)are arranged at intervals (S), and the other end portions of the pair of overlapping rivet protrusions (15, 16) are formed in the direction or phase away from each other. The manufacturing method includes a stack riveting protrusions forming step, a punching step, and a laminating step, and the overlapping rivet protrusions (15, 16) are formed in the stack riveting process. And a punch portion (15, 16) for forming the above-mentioned stacking protrusions(15,16) is provided symmetrically with respect to the punch (30).