A fastening device is disclosed for releasably fastening a mechanism in the region of a floor of an aircraft or spacecraft and includes a base component and a latch component. The latch component includes at least one holding portion including a latch-component-side holding face and is movably coupled to the base component between an unlocked and a locked position. When positioned in a predefined mounting position on the floor component and/or on the base component, the holding portion of the latch component engages a fastening portion, and the latch-component-side holding face faces the mechanism-side holding face. During passage of the latch component from locked position into unlocked position a gap between the latch-component-side holding face and the mechanism-side holding face continuously widens. The invention further relates to an arrangement for a cargo loading system.