An assembly device intended to assemble a first support and a second support together in a configuration where the supports (100, 200) are at least locally superimposed, the assembly device comprising: a closure body extending essentially along a main axis and configured so that it can be fastened in an opening formed in the first support while closing it, by insertion of all or part of the closure body into the opening substantially parallel to the main axis, a spacer offset relative to the closure body along the main axis, intended to pass through the thickness of the second support and comprising bearing elements intended to bear against the second support along the main axis on the side opposite to the closure body to maintain in position the second support in said configuration where the first support and the second support are located one above the other along the main axis at least at the assembly device, and a linking system mechanically linking the closure body and the spacer and having an ability to elastically deform along the main axis in a manner conferring an elastically deformable and damping mechanical linkage between the closure body and the spacer along the main axis such that, under the effect of external forces likely to be applied to the assembly device by the first support and by the second support respectively at the closure body and the spacer, the closure body and the spacer have an ability to elastically get closer to each other along the main axis by acting as a mechanical vibration damper. the linking system comprises a plurality of individual links distinct from one another, where each link mechanically links the closure body and the spacer and where all or part of each link is elastically deformable at least along the main axis, characterized in that each link being constituted, on the one hand, by a lower pin and an upper pin respectively mechanically connected to the closure body and to the spacer and each extending substantially parallel to the main axis while having an offset (Ω) relative to one another transversely to the main axis, on the other hand, by a connecting branch mechanically linking the lower pin and the upper pin together and being inclined relative to the plane orthogonal to the main axis so as to form a non-zero angle ( α). a closure body extending essentially along a main axis and configured so that it can be fastened in an opening formed in the first support while closing it, by insertion of all or part of the closure body into the opening substantially parallel to the main axis, a spacer offset relative to the closure body along the main axis, intended to pass through the thickness of the second support and comprising bearing elements intended to bear against the second support along the main axis on the side opposite to the closure body to maintain in position the second support in said configuration where the first support and the second support are located one above the other along the main axis at least at the assembly device, and a linking system mechanically linking the closure body and the spacer and having an ability to elastically deform along the main axis in a manner conferring an elastically deformable and damping mechanical linkage between the closure body and the spacer along the main axis such that, under the effect of external forces likely to be applied to the assembly device by the first support and by the second support respectively at the closure body and the spacer, the closure body and the spacer have an ability to elastically get closer to each other along the main axis by acting as a mechanical vibration damper. the linking system comprises a plurality of individual links distinct from one another, where each link mechanically links the closure body and the spacer and where all or part of each link is elastically deformable at least along the main axis, characterized in that each link being constituted, on the one hand, by a lower pin and an upper pin respectively mechanically connected to the closure body and to the spacer and each extending substantially parallel to the main axis while having an offset (Ω) relative to one another transversely to the main axis, on the other hand, by a connecting branch mechanically linking the lower pin and the upper pin together and being inclined relative to the plane orthogonal to the main axis so as to form a non-zero angle ( α).