To provide a winding of carbon fiber bundles, a method and device for separating carbon fiber bundles from the winding, whereby it is possible to suppresses a new equipment investment in manufacturing carbon fiber bundles through a baking process of material fiber bundles, heighten the density of fiber bundles in the device in the baking process, establish a high efficiency production of carbon fiber bundles having a less number of filaments, and yield bundles of high quality involving very small generation of fluff.

A plurality of carbon fiber bundles are arranged without orientation or parallel with one another and wound on a single bobbin so that the winding intended is prepared. This winding is separated into individual fiber bundles while a certain tension variation is given under a constant tension.