Abstract: A safety seat has a frame with interconnecting legs intermediate structure and back structure. Securing means such as hooks are associated with the frame to removably mount the frame to a vehicle passenger seat. A seat proportioned to accommodate a child is positionable within the frame. The seat is mounted to the frame by rotation means adapted to the intermediate structure so that the center of gravity of the seat with the child residing therein is below the pivot means. Deceleration means such as a hydraulic cylinder is secured to the seat by attachment means extending below the seat and the center of gravity and to the back structure. Upon application of external forces the seat tends to rotate about the rotation means. The deceleration means acts to retard rotation of the seat about the rotation means.