A belt buckle device (1) for a seat belt including a belt buckle, a drive device (2) coupled or coupleable to the belt buckle, threaded sleeve (5) coupled or coupleable to the belt buckle, a guide part (12) attachable fixed with respect to the vehicle for guiding the threaded sleeve (5) and for supporting the threaded spindle (10), wherein a support plate (9) is provided on the threaded spindle (10) in the axial direction of the threaded spindle (10), which support plate (9) is not displaceable by a tensile force exerted by the belt buckle, via which support plate (9) the threaded spindle (10) is supported in the axial direction on a first thrust support (6) of the guide part (12) to take up tensile forces exerted by the belt buckle.