The present invention relates to an application device (1) of a fluid on a surface to be treated, including: - a sealed reservoir (2, 2 ′) containing the fluid to be applied, and comprising at least one wall which may be pierced, - a cup (3) in which is housed the reservoir (2, 2 ′), which the cup (3) comprises a wall of the bore (31) positioned in the screw - to - screw of the perforated wall of the reservoir (2, 2 ′), which wall of the bore (31) comprises at least one orifice (33) allowing the circulation of the fluid contained in said reservoir (2, 2 ′) after perforation of the perforated wall, an applicator 4 - (,) in fluidic communication with the orifice (33) of the cup (3), - the applicator (4), the cup (3) and the reservoir (2, 2 ′) are coaxial so that an axial translation of the wall of the bore (31) towards the reservoir (2, 2 ′) results in the bore of said reservoir (2, 2 ′) by said wall (31), which movement is initiated by an actuator, characterized in that the applicator (4) is in direct contact with the wall of the bore (31) and acts as an actuator, so that the driving of the translation of said wall (31) towards the reservoir (2, 2 ′) is initiated by a pressure exerted by the applicator (4) on the surface to be treated (s)).Linvention concerne un dispositif dapplication (1) dun fluide sur une surface à traiter comprenant :- un réservoir étanche (2, 2) contenant le fluide à appliquer et comportant au moins une paroi perçable,- une cupule (3) dans laquelle est logé le réservoir (2, 2), laquelle cupule (3) comporte une paroi de perforation (31) positionnée en vis-à-vis de la paroi perçable du réservoir (2, 2), laquelle paroi de perforation (31) comporte au moins un orifice (33) autorisant la circulation du fluide contenu dans ledit réservoir (2, 2) après la perforation de sa paroi perçable,- un applicateur (4,) en communication fluidique avec lorifice (33) de la cupule (3),- lapplicateur (4), la cupule (3) et le réservoir (2, 2) sont coaxiaux de sorte qu
