A sacroiliac fixation implant comprising a one-piece anchoring component supporting a connecting element of the linking rod and provided with three orifices for the passage of anchoring screws, where the anchoring component comprises: an elongated main wall in which are formed two orifices, where the connecting element is interposed between the two orifices; and a secondary wall protruding from the main wall at the level of one end so that the anchoring component has a general «L» shape, a third orifice being formed on said secondary wall; wherein each orifice is internally delimited by a spherical shaped bearing face extended by a truncated-cone shaped flared face centered on a central axis, and wherein the orientations of the central axes and the taper angles of the flared faces are shaped so as to enable an arrangement of the screwing axes of the three anchoring screws.