A device for applying a protective film (P) to the screen (S) of an electronic apparatus (A), wherein the protective film (P) has an upper surface (P') and a lower surface (P") at least partially covered by an adhesive layer (J) intended to be applied to the screen (S) of the apparatus (A), said device comprising: - a support base provided with at least one housing for the positioning of the electronic apparatus (A); - at least one edge portion formed in said support base and arranged on the periphery of said at least one housing ; - a flexible laminar element with a lower surface provided with a first portion at least partially covered with an adhesive layer and with a second portion placed beside said first portion , said first portion being intended to be superimposed to the upper surface (P') of the film (P) in such a way as to create a unit assembly with the latter; - means for the selective coupling of said unit assembly with said at least one edge portion , said coupling means being suited to allow the protective film (P) to selectively rotate around a predetermined hinge axis (X); wherein said coupling means are designed to promote the selective and removable coupling of the second portion of the lower surface of said flexible laminar element with said at least one edge portion of said support base ; characterized in that said coupling means comprise at least one magnetic element associated with said second portion of the lower surface of said flexible laminar element and/or with said at least one edge portion of said base (P). - a support base provided with at least one housing for the positioning of the electronic apparatus (A); - at least one edge portion formed in said support base and arranged on the periphery of said at least one housing ; - a flexible laminar element with a lower surface provided with a first portion at least partially covered with an adhesive layer and with a second portion placed beside said first portion , said first portion being intended to be superimposed to the upper surface (P') of the film (P) in such a way as to create a unit assembly with the latter; - means for the selective coupling of said unit assembly with said at least one edge portion , said coupling means being suited to allow the protective film (P) to selectively rotate around a predetermined hinge axis (X); wherein said coupling means are designed to promote the selective and removable coupling of the second portion of the lower surface of said flexible laminar element with said at least one edge portion of said support base ; characterized in that said coupling means comprise at least one magnetic element associated with said second portion of the lower surface of said flexible laminar element and/or with said at least one edge portion of said base (P). wherein said coupling means are designed to promote the selective and removable coupling of the second portion of the lower surface of said flexible laminar element with said at least one edge portion of said support base ; characterized in that said coupling means comprise at least one magnetic element associated with said second portion of the lower surface of said flexible laminar element and/or with said at least one edge portion of said base (P). <EOS>