Device for checking a tyre, the device comprising: ∘ a detection system comprising a camera having an optical plane passing through the camera and defining a focal plane; ∘ a first light source, a second light source and a third light source adapted for emitting a first light radiation, a second light radiation and a third light radiation, respectively, to illuminate a surface portion of said tyre at or close to said focal plane, said second light source and said third light source being arranged at opposite sides with respect to said optical plane; Characterised in that ∘ said first light source is fixed with respect to said detection system and said second light source and third light source are adapted to be movable from a first inactive configuration where they are controlled not to emit said second light radiation and third light radiation and wherein the distance (d2, d3) of said second light source and of said third light source from said focal plane is greater than the distance of said first light source from said focal plane to an active configuration wherein they are adapted to emit at least one from said second light radiation and said third light radiation and wherein the distance (d2, d3) of said second source and of said third source from said focal plane is equal to or less than the distance of said first source from said focal plane; and it also comprises ∘ a drive and control unit adapted for activating said detection system to acquire a first image and at least a second image of a first surface portion and a second surface portion of said tyre in said inactive configuration and in said active configuration, respectively. ∘ a detection system comprising a camera having an optical plane passing through the camera and defining a focal plane; ∘ a first light source, a second light source and a third light source adapted for emitting a first light radiation, a second light radiation and a third light radiation, respectively, to illuminate a surface portion of said tyre at or close to said focal plane, said second light source and said third light source being arranged at opposite sides with respect to said optical plane; ∘ said first light source is fixed with respect to said detection system and said second light source and third light source are adapted to be movable from a first inactive configuration where they are controlled not to emit said second light radiation and third light radiation and wherein the distance (d2, d3) of said second light source and of said third light source from said focal plane is greater than the distance of said first light source from said focal plane to an active configuration wherein they are adapted to emit at least one from said second light radiation and said third light radiation and wherein the distance (d2, d3) of said second source and of said third source from said focal plane is equal to or less than the distance of said first source from said focal plane; and it also comprises ∘ a drive and control unit adapted for activating said detection system to acquire a first image and at least a second image of a first surface portion and a second surface portion of said tyre in said inactive configuration and in said active configuration, respectively.