Abstract: The invention provides a roof lifeline anchor device for attachment to and between adjacent roof trusses of a building. The anchor comprises an elongated beam having roof truss attachment structure located at each end and a lifeline attachment structure centrally located along the beam. The device attaches to roof trusses in such a manner that forces exerted on lifelines connected thereto will be directed through the anchor into the truss assemblies and be spread across two or more trusses. In the preferred embodiment, the device is fabricated from a steel box beam and the truss attachments are stirrups fabricated from sheet steel sized to fit over the beams of a roof truss. This preferred form is fitted to the truss assemblies from beneath and secured to the trusses by bolts passing through the stirrups and the truss beams so that forces on the lifelines tend to pull the anchor upward against the truss beams.