A head immobilization device for use in the medical field, comprising a head fixation element (7), comprising a mask element (9) and an open frame element (8), said open frame element (8) comprising a base portion (10) and two legs (11), each having an end portion (12), and a support plate structure (1), comprising at least one base fixture element (13) for fixing the base portion (10) and at least two leg fixture elements (3) for fixing the legs (11), whereby said head fixation element (7) can be releasably connected with the support plate structure (1), characterized in that the at least two leg fixture elements (3) are designed to cooperate with the end portions (12) of the legs (11) such as to bias the head fixation element (7) in the direction of the at least one base fixture element (13).
