To provide a winding unit which adjusts the position of a yarn feeding bobbin to a reeling auxiliary device by a simple structure.

The winder unit has a bobbin supply device 60 supplying a yarn feeding bobbin 21, a yarn feeding bobbin support 80 supporting the yarn feeding bobbin 21, and the reeling auxiliary device 12 supporting the yarn reeling of the yarn feeding bobbin 21. The yarn feeding bobbin support 80 has a core member 52, a holding portion 53, and a support surface 86. The core member 52 is inserted into a bobbin tube 21a to direct the reeling auxiliary device at a specified position in the support state. The holding portion 53 holds the yarn feeding bobbin 21 by extending in a direction perpendicular to the shaft center of the core member 52 and contacting with an inner surface of the bobbin tube 21a in the support state. The support surface 86 contacts with an end opposite to the yarn reeling side of the bobbin tube 21a and determines a distance from the end at the yarn reeling side of the bobbin tube 21a to the reeling auxiliary device in the support state.