The invention relates to a cranial bone fastening device (1) for temporarily fastening a cranial bone portion or multiple cranial bone portions to a main body of a positioning device in order to orient the cranial bone portions relative to one another, wherein a pin-like fixing element portion (2) is provided, one side of which is designed to contact the cranial bone portion or multiple cranial bone portions in order to secure the cranial bone portion or cranial bone portions to the main body of the positioning device upon interaction with a counter portion (3) on the other side of the cranial bone portion or cranial bone portions.
