Fluid product dispenser

Fluid product dispenser comprising:

• a—a reservoir module comprising a case accommodating a fluid product cartridge defining a movable wall biased by a spring resting on a bearing, so as to move the movable wall to push fluid product out of the fluid product cartridge,
• b—a dispensing module closing the case and comprising an outlet valve controlled by an actuation member for controlling the passage of the fluid product released under pressure from the fluid product cartridge,
• wherein the reservoir module is removably connected to the dispensing module, so as to give access to the case (R1;
• R1′) and thus be able to extract the fluid product cartridge from the case,
• characterised in that the bearing of the spring is movable relative to the case between an active position in which the spring is compressed and a rest position in which the spring is relaxed, thus making it possible to connect the reservoir module to the dispensing module with the bearing in the rest position, then to move the bearing in the active position.