PURPOSE: To accurately and quickly divide an expanded lamination belt obtained by cutting a ring type lamination belt into unit lamination belts, regarding the manufacturing method of a wound core constituted of an amorphous magnetic alloy thin belt.

CONSTITUTION: In the process of manufacturing a ring type laminate 2, marks are put on an amorphous magnetic alloy thin belt 1, by moving a marking position every number of revolutions corresponding with the constitution number of sheets of unit laminates. In the dividing process from an expanded laminate into the unit laminates, the above markings 3 are indicated at step-difference parts generated on one end side of the expanded laminate, as the division section every specified number of sheets. The division precision into the unit laminates is improved and the efficiency of dividing work is increased.