A deployment device intended to be positioned on a bearing structure, includes a first instrument and a second instrument, a deployment mechanism comprising: a main arm connected to a face of the bearing structure at a first attachment point, on the one hand, and to the first instrument on the other hand, the second instrument being connected to the main arm, a main motor configured to actuate the main arm in relation to the face, a secondary motor configured to actuate the second instrument in relation to the main arm, and in that the two instruments are suitable for passing from a stored configuration, one over the other, on the face of the bearing structure, to a deployed configuration wherein the two instruments are at a distance from one another and from the bearing structure, and/or vice versa.