Abstract: A head restraining device for preventing possibly injurious forward and lateral motion of the head of a child seated in a child's seat, such device comprising a rigid U-shaped restraining member which surrounds the forward and lateral portions of the child's head, and is of a size to be separated therefrom by a slight air gap so as to not be uncomfortable yet be capable of being engaged by the child's head and restraining such from any more than minimal forward and lateral motion. A flexible tether removably and adjustably anchors the head restraint to the back of the child's seat at any selected height. With the restrainer thus anchored, support members at the ends thereof aid in maintaining the restrainer rigid with respect to the front surface of the seat back and preventing the device from slipping out of place relative to the child's head.