To provide a yarn winder which is capable of easily confirming a remaining amount of bobbins in a bobbin stocker and supplying the bobbins stored in the bobbin stocker to a work truck with a simple structure.

A yarn winder includes: spinning units 6 arranged in parallel along a longitudinal direction of a base body 2, each for winding a spun yarn 15 around a winding bobbin 16 to form a package 17; a bobbin stocker 4 for storing the winding bobbins 16 used in the spinning units 6; a doffing truck 67 provided so as to run between the spinning units 6 and the bobbin stocker 4, for supplying the winding bobbins 16 to the spinning units 6. The bobbin stocker 4 is configured so that the doffing truck 67 can access the winding bobbins 16 stored in the bobbin stocker 4 at least from a front side. The doffing truck 67 receives the winding bobbins 16 stored in the bobbin stocker 4 at a bobbin supply position 77 on a front side of the base body 2.