A yarn winder comprising: a yarn supplying portion for unwinding a spun yarn from a yarn supplying bobbin; a winding section for winding the spun yarn so as to form a package; a yarn storage section including a yarn accumulator which is provided between the yarn supplying portion and the winding section to store the spun yarn as the spun yarn is wound onto the yarn accumulator; a yarn joining section for performing a yarn joining operation of joining a yarn end of the spun yarn on the yarn supplying portion side with a yarn end of the spun yarn on the yarn storage section side; and a yarn end drawing mechanism for drawing out the yarn end of the spun yarn wound onto the yarn accumulator to the yarn supplying portion side, when the yarn joining section performs the yarn joining operation, wherein the yarn end drawing mechanism draws out the yarn end of the spun yarn wound onto the yarn accumulator to the yarn supplying portion side, by means of an airflow and the yarn end drawing mechanism includes therein a yarn passage where the spun yarn is able to run, and further includes a yarn guide unit for guiding a part of the spun yarn on the yarn supplying portion side to a predetermined winding position of the yarn accumulator, wherein the predetermined winding position of the yarn accumulator where the spun yarn is guided by the yarn guide unit is, in directions in parallel to a rotation axis of the yarn accumulator, identical with a position where the yarn end drawing mechanism draws out the yarn end of the spun yarn wound onto the yarn accumulator to the yarn supplying portion side by the airflow, a gas flow generator for generating, in the yarn guide unit, a gas flow flowing from the yarn accumulator side to the yarn supplying portion side characterized in that the yarn guide unit is arranged to be rotatable about a winding center axis of the yarn accumulator and guides the part of the spun yarn on the yarn supplying portion side to the outer circumference of the yarn accumulator, and the yarn end drawing mechanism includes the yarn guide unit and the gas flow generator. a yarn supplying portion for unwinding a spun yarn from a yarn supplying bobbin; a winding section for winding the spun yarn so as to form a package; a yarn storage section including a yarn accumulator which is provided between the yarn supplying portion and the winding section to store the spun yarn as the spun yarn is wound onto the yarn accumulator; a yarn joining section for performing a yarn joining operation of joining a yarn end of the spun yarn on the yarn supplying portion side with a yarn end of the spun yarn on the yarn storage section side; and a yarn end drawing mechanism for drawing out the yarn end of the spun yarn wound onto the yarn accumulator to the yarn supplying portion side, when the yarn joining section performs the yarn joining operation, wherein the yarn end drawing mechanism draws out the yarn end of the spun yarn wound onto the yarn accumulator to the yarn supplying portion side, by means of an airflow and the yarn end drawing mechanism includes therein a yarn passage where the spun yarn is able to run, and further includes a yarn guide unit for guiding a part of the spun yarn on the yarn supplying portion side to a predetermined winding position of the yarn accumulator,