Abstract: A head immobilization device for an accident patient and a manufacturing blank of sheet material, such as cardboard, for making such a device are described. The manufacturing blank is H-shaped and provided with fold lines. The blank is folded to form the head immobilization device with a pair of triangular cylinders which extend longitudinally upward from the top surface of a head support center section on opposite sides of such section to prevent lateral movement of the head. The head immobilization device is provided with adhesive tape on the bottom surface of the center section to attach such device to a flat support such as a back-board. Ear hole slots are provided in the inner sides of the triangular cylinders to enable examination of the ears. The sides of the triangular cylinders are releasably fastened by hook and loop fasteners.