A transverse limb (5, 6) for connecting two side portions (3, 4) of a member of a line guide device, wherein the transverse limb (5, 6) is lockable at least at one of its ends (9) to the side portion (5, 6) to be connected there. For improved locking of the transverse limb to the side portion it is proposed that it has an actuating portion (7) and a locking portion (8) which is displaceable by way of the actuating portion (7) substantially in the longitudinal direction of the transverse limb (5, 6) towards the end (9) with which the transverse limb (5, 6) can be connected to the side portion (3, 4), into a locking position in which the transverse limb (5, 6) is lockable to the side portion (3, 4), and is displaceable away from said end (9) into an unlocking position in which the transverse limb (5, 6) is releasable from the side portion (3, 4).