To provide the mounting structure of a decorative glazing bar used for decoration and reinforcement on a roof by a long lateral roofing material at regular intervals.

In a lateral roofing roof seamed and connected to the lower face, the hooking clip seam 16 of the edge of a hooking clip A14 is inserted in and fixed on the seam part of a roof material connection part at a regular interval, both the side ends 4 of a winding seam formed folding both the edges in the form of a shape half cylinder inward are provided, and a decorative glazing bar pressing both the side ends of the winding seam of the decorative glazing bar A3 providing double ribs 5, 6 on both the ends of the longitudinal direction on the lower face of both the side parts 15 of the hooking clip is fixed. The decorative glazing bar is mounted from a throating 0 under a ridge to an eaves successively, and the fitting rib 13 of a decorative gap 12 is fitted and fixed to the rib 6 of the eaves of the lowermost decorative glazing bar.