Abstract: A head immobilizer apparatus includes a base plate having mounting members on outer edges which are releasably engagable through apertures to a spine board. In one aspect, the mounting members are cantilevered clips include a first leg projecting downward from the plane of the base plate and an outwardly and upwardly extending second leg. Alternately, a pair of clips may be formed on each opposed side edge and one additional clip formed on one end edge of the base plate. A flange is disposed adjacent to at least one side edge of each clip and is unitarily formed as part of the base plate. Each flange extends outward for substantially the same length as the adjacent clip to sandwich an outer edge of the spine board therebetween under spring force generated by the resilient, cantilever clips.