A spun yarn winding apparatus configured to wind yarns spun out from a spinning apparatus onto bobbins, comprising: bobbin holders by which the bobbins are retained to be lined up in an axial direction; a traverse unit which is configured to traverse the yarns; a yarn threading mechanism (30, 40, 50, 60) which is configured to thread the yarns into slits formed in outer circumferential surfaces of new bobbins, when bobbins on which yarns are wound are switched from bobbins retained by one of the bobbin holders to the new bobbins retained by another one of the bobbin holders; and a controller, the yarn threading mechanism (30, 40, 50, 60) including: guides (31, 41, 51, 61) which are provided to correspond to the respective new bobbins and are movable in the axial direction, the guides (31, 41, 51, 61) moving toward the corresponding slits after capturing the yarns traversed by the traverse unit and then threading the yarns into the slits; a driving unit configured to move the guides (31, 41, 51, 61) in the axial direction; and a bobbin position sensor configured to detect a position in the axial direction of a predetermined part of the new bobbins, the controller adjusting positions in the axial direction of the guides (31, 41, 51, 61) by controlling the driving unit based on a detection result of the bobbin position sensor; characterized in that the driving unit includes: a supporting member (33, 43, 54, 63) which supports the guides (31, 41, 51, 61); and a mover (34, 44, 55, 64) which is configured to move the guides (31, 41, 51, 61) together in the axial direction by moving the supporting member (33, 43, 54, 63) in the axial direction. bobbin holders by which the bobbins are retained to be lined up in an axial direction; a traverse unit which is configured to traverse the yarns; a yarn threading mechanism (30, 40, 50, 60) which is configured to thread the yarns into slits formed in outer circumferential surfaces of new bobbins, when bobbins on which yarns are wound are switched from bobbins retained by one of the bobbin holders to the new bobbins retained by another one of the bobbin holders; and a controller, the yarn threading mechanism (30, 40, 50, 60) including: guides (31, 41, 51, 61) which are provided to correspond to the respective new bobbins and are movable in the axial direction, the guides (31, 41, 51, 61) moving toward the corresponding slits after capturing the yarns traversed by the traverse unit and then threading the yarns into the slits; a driving unit configured to move the guides (31, 41, 51, 61) in the axial direction; and a bobbin position sensor configured to detect a position in the axial direction of a predetermined part of the new bobbins, the controller adjusting positions in the axial direction of the guides (31, 41, 51, 61) by controlling the driving unit based on a detection result of the bobbin position sensor; characterized in that the driving unit includes: a supporting member (33, 43, 54, 63) which supports the guides (31, 41, 51, 61); and a mover (34, 44, 55, 64) which is configured to move the guides (31, 41, 51, 61) together in the axial direction by moving the supporting member (33, 43, 54, 63) in the axial direction. guides (31, 41, 51, 61) which are provided to correspond to the respective new bobbins and are movable in the axial direction, the guides (31, 41, 51, 61) moving toward the corresponding slits after capturing the yarns traversed by the traverse unit and then threading the yarns into the slits; a driving unit configured to move the guides (31, 41, 51, 61) in the axial direction; and a bobbin position sensor configured to detect a position in the axial direction of a predetermined part of the new bobbins, the controller adjusting positions in the axial direction of the guides (31, 41, 51, 61) by controlling the driving unit based on a detection result of the bobbin position sensor; characterized in that the driving unit includes: a supporting member (33, 43, 54, 63) which supports the guides (31, 41, 51, 61); and a mover (34, 44, 55, 64) which is configured to move the guides (31, 41, 51, 61) together in the axial direction by moving the supporting member (33, 43, 54, 63) in the axial direction. a supporting member (33, 43, 54, 63) which supports the guides (31, 41, 51, 61); and a mover (34, 44, 55, 64) which is configured to move the guides (31, 41, 51, 61) together in the axial direction by moving the supporting member (33, 43, 54, 63) in the axial direction.