Abstract: The skeletal anchorage device according to the invention for attaching at least one orthodontic element to be used for orthodontic treatment comprises an anchorage element (10) which has an anchorage section (12) that is arranged to be attached skeletally, and also has an attachment section (14) that is arranged to be coupled with the at least one orthodontic element. According to the invention, the attachment section (14) is provided with an attachment arrangement that is designed such that the orthodontic element may be clamped to the attachment section (14) with continually adjustable clamping force at least in certain sections.