To improve the working precision of a connecting portion of each of a plurality of laminated core pieces to be split in collectively manufacturing the laminated core pieces making up a split laminated core.

A manufacturing method for the split laminated core 3 includes a splitting process of splitting a connecting portion 4 of each of a plurality of stator core pieces 7 along a given split line 5, a process of punching out a split assist hole H whose periphery crosses one end 5a of the split line 5, and a process of punching out a slot S2 whose periphery crosses the other end 5b of the split line 5. Both punching processes are carried out at least before the splitting process.