Abstract: A device for the safety of occupants on automotive vehicle seats having two straps for extending over the occupant's shoulders with the two straps being combined in superposed relation at a distance behind and substantially above the shoulders of the occupant. A first securing arrangement is provided for coupling the combined straps to a portion of the vehicle and a second securing arrangement is provided which is securable to at least one portion of the vehicle and extends along at least a portion of the width of the vehicle seat. Guide devices are coupled to and movable with respect to the second securing arrangement with the guide devices receiving the two straps extending over the shoulders of the occupant and diverting the end portions of the straps at the level of the pelvis of the occupant to form lap belt portions connectable in front of the occupant. A seat member may also be provided which is retained on the vehicle seat by the guide devices.