A rotary guide for uninterrupted guidance of at least one line between two points (3, 4) rotatable relative to one another, the rotary guide comprising: two receiving parts (12, 14) mounted rotatably about a common axis of rotation relative to one another, for receiving respectively one of two sub-portions (29, 31), to be wound up about the common axis of rotation in opposing directions, of a line portion receivable in the rotary guide, and a deflection unit for supporting a deflection region, in which the line portion of the line to be guided can be turned around between the sub-portions (29, 31) to be wound up in opposing directions, such that the at least one line to be guided is deflected on relative rotation of the receiving parts (12, 14) about the common axis of rotation from one receiving part (12, 14) into the other receiving part (12, 14), characterized in that each of the receiving parts (12, 14) has a spiral receiving groove (20, 22) with a plurality of turns (24, 26) extending around the common axis of rotation and from an initial radius (r a) to an end radius (r e) for at least partial reception of a line portion in the receiving groove (20, 22), wherein the turns (24, 26) of the receiving groove (20, 22) of each receiving part (12, 14) respectively extend in a plane predetermined by the receiving part (12, 14) perpendicular to the common axis of rotation, and in that the deflection unit has at least one active area extended radially or adjustable radially between the initial radius (r a) and the end radius (r e), which interacts with the receiving grooves (20, 22) of the receiving parts (12, 14) in order, on relative rotation of the receiving parts (12 14) about the common axis of rotation, to wind the line portion of the at least one line to be guided from the receiving groove (20, 22) of the one receiving part (12, 14) into the receiving groove (20, 22) of the other receiving part (12, 14). two receiving parts (12, 14) mounted rotatably about a common axis of rotation relative to one another, for receiving respectively one of two sub-portions (29, 31), to be wound up about the common axis of rotation in opposing directions, of a line portion receivable in the rotary guide, and a deflection unit for supporting a deflection region, in which the line portion of the line to be guided can be turned around between the sub-portions (29, 31) to be wound up in opposing directions, such that the at least one line to be guided is deflected on relative rotation of the receiving parts (12, 14) about the common axis of rotation from one receiving part (12, 14) into the other receiving part (12, 14), characterized in that each of the receiving parts (12, 14) has a spiral receiving groove (20, 22) with a plurality of turns (24, 26) extending around the common axis of rotation and from an initial radius (r a) to an end radius (r e) for at least partial reception of a line portion in the receiving groove (20, 22), wherein the turns (24, 26) of the receiving groove (20, 22) of each receiving part (12, 14) respectively extend in a plane predetermined by the receiving part (12, 14) perpendicular to the common axis of rotation, and in that the deflection unit has at least one active area extended radially or adjustable radially between the initial radius (r a) and the end radius (r e), which interacts with the receiving grooves (20, 22) of the receiving parts (12, 14) in order, on relative rotation of the receiving parts (12 14) about the common axis of rotation, to wind the line portion of the at least one line to be guided from the receiving groove (20, 22) of the one receiving part (12, 14) into the receiving groove (20, 22) of the other receiving part (12, 14).