Releasable device for fixing two mechanical parts, vehicle apparatus with such a device and a corresponding vehicle with such an arrangement

This device comprises at least one pair of fastening elements (23), forming a snap-fit connection according to a first direction (Z). The second fastening element of the pair (23) forming a snap-fit connection comprises a protruding rod extending from the second mechanical part, and an enlarged head at the free end of the rod, while the first fastening element (51) of the pair (23) forming a snap-fit connection comprises a block made of elastomeric material integral with the mechanism (1), and a head receiving and locking member housed in said elastomeric block. The invention also relates to a motor vehicle equipped with such a device.