The invention relates to a diffusion device, in particular for motor vehicles, said device including a cartridge (130) which includes a plurality of volatile agents, in particular fragrances, each of which is accommodated in a cavity (340) suitable for an air flow (120) to pass therethrough, said device further including a selector (125a, 125b) equipped with an inlet (260a) and an outlet (260b) for said air flow (120), said cartridge (130) and said selector (125a, 125b) being movable relative to one another so as to connect said inlet (260a) and said outlet (260b) to at least one of said cavities (340) so that said air flow (120) passes therethrough.
