The invention relates to a device for distributing a fluid product, comprising a body (10), and at least one individual reservoir containing a single dose of fluid product, such as a powder, opening means (80) being provided for opening an individual reservoir each time the device is actuated, the device comprising an inhalation end-fitting (5) and a system (60) that is triggered by inhalation, which system comprises a deformable air chamber (61) interacting with said inhalation end-fitting (5) and a triggering element (600) interacting with said air chamber (61), so that, during inhalation through said inhalation end-fitting (5), said air chamber (61) is deformed and said triggering element (600) actuates said opening means (80) so that a reservoir is opened by said opening means, said air chamber (61) comprising a deformable lateral body (611), a first open end comprising a peripheral edge (62) encircling an aperture forming the inlet of said hollow pocket, and a second end forming the bottom of said hollow pocket, said second end comprising connecting means (63) for connecting said air chamber to said triggering element (600), said lateral body (611) taking the form of a bellows comprising a plurality of bellows portions (611a, 611b, 611c, etc.), advantageously six, arranged axially one after the other, said bellows-shaped lateral body (611) comprising bellows portions having different outside diameters and/or inside holes.Dispositif de distribution de produit fluide, comportant un corps (10), au moins un réservoir individuel contenant une dose unique de produit fluide, tel que de la poudre, des moyens douverture (80) étant prévus pour ouvrir un réservoir individuel à chaque actionnement du dispositif, le dispositif comportant un embout dinhalation (5) et un système de déclenchement par linhalation (60) qui comporte une chambre dair déformable (61) coopèrent avec ledit embout dinhalation (5) et un élément déclencheur (600) coopérant avec ladite chambre dair (61),
