Securing device for a component that can be secured on rails of a floor structure of an aircraft interior, wherein - at least two adapter plates are provided which are decoupled from one another and can be secured on the rails, on which plates the component having mutually spaced securing attachments can be secured, wherein - each of the adapter plates can be secured on two different rails, - each adapter plate being mounted on one of the rails at a first mounting point (B1, D1) and on the other rail at two second mounting points (A1, A2, C1, C2) during installation, so that - the adapter plates are held in place on the rails at three mounting points when installed, and - the adapter plates are mounted on the rails so as to be slidable at the first mounting points (B1, D1), wherein - ball-and-socket joints are in each connection between the adapter parts and the rails, and - each ball-and-socket joint is formed by a dimensionally stable ball and a dimensionally stable ball socket, wherein - each dimensionally stable ball socket being formed by two dimensionally stable ball socket halves (17, 18), wherein - the balls of the ball-and-socket joints are associated with the rails and the ball sockets are associated with the adapter plates, wherein - the two ball socket halves (17, 18) of a ball-and-socket joint are respectively arranged on a support plate (2, 3) and, in an assembled position, the two halves complement each other to form the ball socket and comprise at least one securing attachment, and - the two support plates (2, 3) in the assembled position are each connected by means of a tongue and groove joint to an adapter plate when assembled, wherein - the tongue and groove joint being oriented transversely, preferably perpendicularly, to the rails to which the relevant adapter plate is secured. - at least two adapter plates are provided which are decoupled from one another and can be secured on the rails, on which plates the component having mutually spaced securing attachments can be secured, wherein - each of the adapter plates can be secured on two different rails, - each adapter plate being mounted on one of the rails at a first mounting point (B1, D1) and on the other rail at two second mounting points (A1, A2, C1, C2) during installation, so that - the adapter plates are held in place on the rails at three mounting points when installed, and - the adapter plates are mounted on the rails so as to be slidable at the first mounting points (B1, D1), wherein - ball-and-socket joints are in each connection between the adapter parts and the rails, and - each ball-and-socket joint is formed by a dimensionally stable ball and a dimensionally stable ball socket, wherein - each dimensionally stable ball socket being formed by two dimensionally stable ball socket halves (17, 18), wherein - the balls of the ball-and-socket joints are associated with the rails and the ball sockets are associated with the adapter plates, wherein - the two ball socket halves (17, 18) of a ball-and-socket joint are respectively arranged on a support plate (2, 3) and, in an assembled position, the two halves complement each other to form the ball socket and comprise at least one securing attachment, and - the two support plates (2, 3) in the assembled position are each connected by means of a tongue and groove joint to an adapter plate when assembled, wherein - the tongue and groove joint being oriented transversely, preferably perpendicularly, to the rails to which the relevant adapter plate is secured.