Abstract: The binder comprises two faces, a back and two flaps respectively extending a face and adapted to be folded to close the binder, an external envelope of plastic material, a ring mechanism fixed inside the back, and a magnetic closure arranged on the flaps, this magnetic closure being constituted by a magnet positioned in a housing of the plastic envelope defining a flap, and a metallic plate positioned in a housing of the envelope defining the second flap. The plate and the magnet have identical dimensions and a placed so that their perimeters coincide to be applied one against the other.