A fluid product dispensing device comprises: - an outer body (10) provided with a dispensing opening (11)； - an inner body (20) that is axially movable in relation to the outer body (10) between a rest position and an actuation position, the inner body (20) forming a reservoir (22) that contains the fluid product to be dispensed； - a first elastic element (30), such as a spring, to bias the inner body (20) towards its rest position； - an axial tubular element (50) secured to the outer body (10), inside the inner body (20), and partially defining an expelling channel (40) that ends at the dispensing opening (11)； - a piston (60) mounted in the reservoir (22), around the axial tubular element (50), so as to slide between a rest position and a dispensing position； - a second elastic element (70) such as a spring, to bias the piston (60) towards its rest position； - a metering chamber (80) defined in the inner body (20), between the piston (60) and the axial tubular element (50), the metering chamber (80), in the rest position, being connected to the reservoir (22) and isolated from the expelling channel (40) and, during the actuation of the device, being isolated from the reservoir (22) and connected to the expelling channel (40)； - the metering chamber (80) being arranged, in the upright use and storage position, under the reservoir (22), thus being automatically filled while at rest with the fluid product contained in the reservoir, under the effect of the force of gravity.Dispositif de distribution de produit fluide comportant: - un corps externe (10) pourvu d'un orifice de distribution (11), - un corps interne (20), mobile axialement par rapport audit corps externe (10) entre une position de repos et une position d'actionnement, ledit corps interne (20) formant réservoir (22) contenant le produit fluide à distribuer, - un premier élément élastique (30), tel qu'un ressort, pour solliciter ledit corps interne (20) vers sa position de repos, - un organe tubulaire axia
