An intervertebral implant 1 having a lower implant part 2 and an upper implant part 5. The lower implant part 2 has a hollow cylindrical cavity 3 with an outer casing 14 and an axis of rotation 11, and an apposition part 4 intended for contacting the covering surface of the adjoining lower vertebra. The upper implant part 5 has an essentially circularly cylindrical shaft 6, which has an external thread 7 and an axis of rotation 11 and extends into the cavity 3 of the lower implant part 2, and an apposition part 8, intended for contacting the covering surface of the adjoining upper vertebra. The two implant parts 2, 5 may be secured to prevent rotation about their axis of rotation 11. The implant 1 also includes a ring 9 with an internal thread 10, which is disposed between the two implant parts 2, 5 and interacts with the external thread 7 of the upper implant part 5. The two implant parts 2, 5 and the ring 9 may be disposed coaxially along their common axis of rotation 11, so that, by rotating the ring 9 on the external thread 7 of the shaft 6, the distance between the two apposition parts 4, 8 can be infinitely variably changed. Furthermore, the ring 9 may be axially fixed but rotatively movably with the lower implant part 2. As a result, simplified handling is possible, which, increases the safety and reduces the time required for the implantation into a patient.