A yarn guide device for a two-for-one twister comprises a guide pipe disposed upright above yarn packages placed on a spindle, which guides yarns unwound from the yarn packages into the bore of the packages from above the same, and a freely rotatable ring member provided on the guide pipe to be contacted with the yarns and to bend slightly a yarn path at the peripheral end thereof. The ring member is rotated by the yarns released from the package in a direction of releasing of the yarns.