A fluid dispenser device comprising: • a body provided with a dispenser orifice; • at least one cover element (11, 12) that is movable between a closed position and an open position; • a plurality of individual reservoirs each containing a dose of fluid, such as a pharmaceutical powder, said reservoirs being formed on a reservoir substrate; • movable support means that receive said reservoir substrate, and that are displaceable between a non-dispensing position and a dispensing position; • reservoir opening means for opening a respective reservoir each time said opening means are actuated; • said reservoir substrate being displaceable, together with said movable support means, between the non-dispensing position, in which it does not co-operate with said opening means, and the dispensing position, in which said opening means open a respective reservoir; • loading means for urging said movable support means towards said dispensing position; • blocking means for retaining said movable support means in the non-dispensing position; • trigger means for releasing said blocking means and for enabling said movable support means, together with said reservoir substrate, to be displaced towards said dispensing position; and • said loading means include an elastically-deformable loading element (51; 51'; 1051') that co-operates with a cam surface (910; 910'; 1910), characterized in that said cam surface (910; 910'; 1910) comprises at least two different sloping surfaces, a first cam-surface portion that is adapted to deform and/or load said loading means, and a second cam-surface portion that co-operates with said loading means that are deformed and/or loaded, in the open position of the device. • a body provided with a dispenser orifice; • at least one cover element (11, 12) that is movable between a closed position and an open position; • a plurality of individual reservoirs each containing a dose of fluid, such as a pharmaceutical powder, said reservoirs being formed on a reservoir substrate; • movable support means that receive said reservoir substrate, and that are displaceable between a non-dispensing position and a dispensing position; • reservoir opening means for opening a respective reservoir each time said opening means are actuated; • said reservoir substrate being displaceable, together with said movable support means, between the non-dispensing position, in which it does not co-operate with said opening means, and the dispensing position, in which said opening means open a respective reservoir; • loading means for urging said movable support means towards said dispensing position; • blocking means for retaining said movable support means in the non-dispensing position; • trigger means for releasing said blocking means and for enabling said movable support means, together with said reservoir substrate, to be displaced towards said dispensing position; and • said loading means include an elastically-deformable loading element (51; 51'; 1051') that co-operates with a cam surface (910; 910'; 1910), characterized in that said cam surface (910; 910'; 1910) comprises at least two different sloping surfaces, a first cam-surface portion that is adapted to deform and/or load said loading means, and a second cam-surface portion that co-operates with said loading means that are deformed and/or loaded, in the open position of the device.