A device for dispensing a fluid product, having a body (1) and a dispensing head (2) that is provided with a dispensing orifice (3) and is movable axially with respect to said body (1) during actuation, said body (1) holding a reservoir (10) containing fluid product, said reservoir (10) having a hollow tube (11) that has a proximal axial opening (12) closed by a stopper (20) that is designed to slide in a leaktight manner in said tube (11) during actuation, said dispensing head (2) having a hollow cannula (4) that is connected on one side to said dispensing orifice (3) and provided on the other side with a piercing tip (5) provided with an opening (6) for piercing said stopper (20), said opening (6) defining a peripheral edge (7) that extends about said opening (6) and has a distal axial end and a proximal axial end, said distal axial end of said peripheral edge (7) forming the distal axial end (59) of the piercing tip (5), said distal axial end (59) of the piercing tip (5) being disposed along the longitudinal central axis (A) of said cannula (4).Dispositif de distribution de produit fluide comportant un corps (1) et une tête de distribution (2) pourvue d'un orifice de distribution (3) et déplaçable axialement par rapport audit corps (1) lors de l'actionnement, ledit corps (1) recevant un réservoir (10) contenant du produit fluide, ledit réservoir (10) comportant un tube creux (11) ayant une ouverture axiale proximale (12) fermée par un bouchon (20) adapté à coulisser de manière étanche dans ledit tube (11) lors de l'actionnement, ladite tête de distribution (2) comportant une canule creuse (4) reliée d'un côté audit orifice de distribution (3) et pourvue de l'autre côté d'une pointe de perçage (5) pourvue d'une ouverture (6) pour percer ledit bouchon (20), ladite ouverture (6) définissant un bord périphérique (7) s'étendant autour de ladite ouverture (6) et comportant une extrémité axiale distale et une extrémité axiale proximale, ladite extrémité axiale distale d
