To make operation of an automatic winder more efficient while reducing burden on an operator in a bobbin supplying device for the automatic winder.SOLUTION: A bobbin supply device 100 supplies a bobbin 6 to an automatic winder 1 provided with a plurality of winding units 4 for unwinding yarn from the bobbin 6 to form a package. The bobbin supply device 100 includes: a supply path 73; a discharge path 74; a return path 75; and a selective supply device 82. The supply path 73 supplies the bobbins 6 to the respective winding units 4. To the discharge path 74, unwinding completed bobbins 6e which are bobbins in which all the yarn is unwound in the winding units 4, and unwinding incomplete bobbins 6b which are bobbins before all the yarn is unwound, are discharged. The return path 75 returns the unwinding incomplete bobbins 6b discharged to the discharge path 74 back to the supply path 73. The selective supply device 82 selects and supplies unwinding incomplete bobbins 6b among bobbins 6 in the supply path 73 to unwinding remaining processing units 4s, which are part of the plurality of winding units 4.SELECTED DRAWING: Figure 1
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