A stacker device for flat articles stacked on edge, said device including at least one support defining a bearing plane suitable for receiving said stack of flat articles being formed along a predefined stacking path, a retaining paddle carried by a first slideway disposed laterally relative to said bearing plane and along which said retaining paddle is mounted to be moveable in translation along said stacking path between an upstream position and a downstream position, and to be retractable manually between a working position in which it extends above said bearing plane to a first working height and interferes with said stacking path so as to receive the surface of a flat article bearing against it and a resting position in which it does not interfere with said stacking path, said retaining paddle being coupled to braking means arranged to oppose movement of said retaining paddle during stacking, said stacker device further comprising at least one holding finger suitable for being in a deployed position in which it extends above said bearing plane to a second working height less than said first working height and interferes with said stacking path so as to receive the foot of a flat article bearing against it, said holding finger being coupled to return means tending to oppose movement of said holding finger so as to prevent the foot of said flat article from slipping towards the front of said stack, said holding finger and said retaining paddle being arranged to be independent from each other so that said holding finger is suitable for retaining said foot of the flat article even when said retaining paddle is in its resting position, characterized in that said holding finger in a extended position is further arranged to be pushed by said retaining paddle in a working position when the latter is moved to its downstream position so that said retaining paddle and the holding finger advance gradually as the stack of said stack of flat articles is being formed behind said retaining paddle, in that said support is formed by two conveyor belts that are mutually parallel and that are spaced apart from each other so as to provide an access zone between them that is suitable for receiving the hand of an operator passing through from below said bearing plane to access said flat articles, in that the stacker device includes at least one drive belt provided under said bearing plane between said conveyor belts and coupled to said conveyor belts so as to move therewith, in that said retaining paddle includes an extension arranged so that, when said retaining paddle is in said working position, said extension passes through said bearing plane and bears against said drive belt so that said retaining paddle is coupled to said drive belt so as to move therewith, and in that at least one of the elements comprising said holding finger and said retaining paddle has an abutment arranged to come to bear respectively against said retaining paddle or against said holding finger, and to prevent said holding finger from moving upstream from said retaining paddle along said stacking path, said holding finger being blocked until its upstream surface is in contact with the downstream surface of the retaining paddle, said holding finger being supported by a second slideway different from the first slideway which is provided laterally along said stacking path on the same side of the first slideway and on which the holding finger is movable in translation according to said stacking path between downstream position and upstream position.