An apparatus is provided for supporting a worker on an upper chord of a roof truss. The apparatus includes a saddle member which is positioned over an installed upper chord of a roof truss and secured thereto to prevent inadvertent movement of the apparatus with respect to the upper chord upon which it is mounted. The apparatus includes a pair of hanger assemblies which are pivotally secured to the saddle member and which extend downwardly therefrom for supporting a pair of footrests thereon. In use, the worker straddles the saddle member and the chord upon which it is mounted with his/her feet resting on the footrests. The footrests may be adjusted to compensate for varying roof pitches.