Noise insulating partition for an internal volume, of an automotive vehicle, in particular.

The partition (21) has a fixed panel on which an acoustic resonator e.g. Helmholtz resonator, is disposed and presenting a cavity communicating with a side of the partition turned towards a cabin through an opening (263). The acoustic resonator is integrated to a rigidification unit. A groove of the panel is closed by a plate to define a resonant cavity which is housed in a caisson (26).