A fluid dispenser device triggered by inhaling, comprising a fluid reservoir containing a fluid and a propellant gas, a metering valve being assembled on said reservoir for selectively dispensing the fluid, said device further comprising: • a cocking member that is movable firstly between a rest position and a primed position by compressing a spring, and that is axially movable secondly between said primed position and a dispensing position under the effect of the force exerted by said compressed spring; • blocking means for blocking said cocking member in said primed position; and • a trigger system that is controlled by inhaling so as to release said blocking means; the device being characterized in that said cocking member includes a set of teeth, and in that it further comprises: • a reservoir support element that is fastened to said reservoir and that includes a cam opening; and • a meshing wheel comprising firstly a toothed projection that is adapted to co-operate with said set of teeth of said cocking member, and secondly a cam projection that is adapted to co-operate with said cam opening of said reservoir support element, said toothed projection being substantially centered relative to the axis of rotation of said meshing wheel, and said cam projection being offset relative to said axis of rotation, said meshing wheel co-operating with said cocking member so that when said cocking member moves from its primed position towards its dispensing position, said meshing wheel performs a complete turn, such that said cam projection performs a circular movement causing said reservoir support element to perform reciprocating axial movement, with a first axial movement for actuating said valve and a second axial movement in the opposite direction for returning the valve into its rest position. • a cocking member that is movable firstly between a rest position and a primed position by compressing a spring, and that is axially movable secondly between said primed position and a dispensing position under the effect of the force exerted by said compressed spring; • blocking means for blocking said cocking member in said primed position; and • a trigger system that is controlled by inhaling so as to release said blocking means; • a reservoir support element that is fastened to said reservoir and that includes a cam opening; and • a meshing wheel comprising firstly a toothed projection that is adapted to co-operate with said set of teeth of said cocking member, and secondly a cam projection that is adapted to co-operate with said cam opening of said reservoir support element, said toothed projection being substantially centered relative to the axis of rotation of said meshing wheel, and said cam projection being offset relative to said axis of rotation, said meshing wheel co-operating with said cocking member so that when said cocking member moves from its primed position towards its dispensing position, said meshing wheel performs a complete turn, such that said cam projection performs a circular movement causing said reservoir support element to perform reciprocating axial movement, with a first axial movement for actuating said valve and a second axial movement in the opposite direction for returning the valve into its rest position.