To secure easily and reliably the safety of a worker on a roof by providing a rope in the connected portion of a bifurcated hooking device made by connecting hooking members to be hooked to between a coping and a roof tile at one end.

A hooking device 4 is turned into a bifurcated hooking device by connecting hooking members 3 at one end, and the connection of the hooking members 3 at one end is completed by a ring 11 provided in the connected portion 7 of the hooking device 4. And a fixing clip 12 is arranged at the end of a rope 5, and the fixing clip 12 is attached to the belt of a worker during work on a roof. In this case, the hooking members 3 of the bifurcated hooking device 4 are hooked into between the coping 1 and a roof tile 2 in a manner of straddling the ridge 10 of the roof. In addition, the safety of a worker is secured easily by providing a rope 5 in the connected portion 7 of the hooking device 4, thereby using the rope provided in the connected portion 7 as a lifeline and securing easily the safety of a worker.