Device for supporting a safety line, in particular for preventing the accidental falling of personnel working in places presenting this risk, having at least one elongated tubular element for guiding the passage of the cable of the safety line, wherein this tubular element is retained by at least two supports, spaced apart and designed to be fixed to a fixed surface, characterized in that the elongated tubular element is of a flexible plastic material so that it is able to conform to the shape of a curve to be produced.