Cable concealing device, intended to be attached to the wall of a building, comprising an integral profile made of an elastomer material, said profile comprising: - a semi-tubular section defining a housing portion, configured to define, in combination with said wall of a building, once the cable concealing device is attached to said wall, a housing capable of receiving one or more cables attached to said wall, - a section forming an attachment portion, positioned in the extension of the semi-tubular section, and configured to be attached to said wall of a building by means of at least one attachment means, said cable concealing device further comprising a stiffening element made of a metal material, configured to plastically deform, and extending within said profile made of elastomer material, said stiffening element cooperating with said profile, such that the profile and stiffening element assembly is configured to be manually shaped by plastic deformation of said stiffening element along a non-rectilinear trajectory, with said elastically deformed profile retaining its shape, by said plastically deformed stiffening element, characterised in that the profile has a cross section substantially in the shape of a question mark, with the housing portion forming the upper rounded portion of the question mark and the attachment portion, in the extension of the housing portion, forming the rectilinear lower portion of the question mark, so that the cable concealing device is configured such that a housing is formed only between the housing portion of the profile and a wall to which it is attached, and in that the section forming the attachment portion extends substantially rectilinearly from the semi-tubular section of the profile, and is configured to abut against said wall of the building at its inner face, and wherein the free end of the profile, located opposite the attachment portion, extends beyond an imaginary straight line following the rectilinear trajectory of the attachment portion, and extending on the side opposite the remainder of the profile, when not elastically constrained, so as to elastically constrain the semi-tubular section, in simple abutment by its free end against said wall of a building, when said cable concealing device is attached to said wall of the building by its attachment portion. - a semi-tubular section defining a housing portion, configured to define, in combination with said wall of a building, once the cable concealing device is attached to said wall, a housing capable of receiving one or more cables attached to said wall, - a section forming an attachment portion, positioned in the extension of the semi-tubular section, and configured to be attached to said wall of a building by means of at least one attachment means, said cable concealing device further comprising a stiffening element made of a metal material, configured to plastically deform, and extending within said profile made of elastomer material, said stiffening element cooperating with said profile, such that the profile and stiffening element assembly is configured to be manually shaped by plastic deformation of said stiffening element along a non-rectilinear trajectory, with said elastically deformed profile retaining its shape, by said plastically deformed stiffening element, characterised in that the profile has a cross section substantially in the shape of a question mark, with the housing portion forming the upper rounded portion of the question mark and the attachment portion, in the extension of the housing portion, forming the rectilinear lower portion of the question mark, so that the cable concealing device is configured such that a housing is formed only between the housing portion of the profile and a wall to which it is attached, and in that the section forming the attachment portion extends substantially rectilinearly from the semi-tubular section of the profile, and is configured to abut against said wall of the building at its inner face, and wherein the free end of the profile, located opposite the attachment portion, extends beyond an imaginary straight line following the rectilinear trajectory of the attachment portion, and extending on the side opposite the remainder of the profile, when not elastically constrained, so as to elastically constrain the semi-tubular section, in simple abutment by its free end against said wall of a building, when said cable concealing device is attached to said wall of the building by its attachment portion.