PURPOSE: To improve workability for supporting a ceiling by enhancing waterproofing quality at the fixed position of a roof material and effectively utilizing a fastener.

CONSTITUTION: A plurality of fasteners 7 are made to pass through a tiled roof material 2a at intervals along a direction toward an eaves, and nut cylinders 3 are suspended from the lower ends of the fasteners 7. Also, a hanger threaded rod 8 is screwed to each cylinder 3. A nut 4 is screwed to the head of a threaded rod section 1 in such state as capable of freely advancing. Also, a stopper vane 5 expandable under the pressing force of the nut 4 is provided at the lower section thereof. A receiving step section 6 for preventing the downward motion of the vane 5 is formed on the section 1. Furthermore, a ceiling material 10 is jointed to the hanger threaded rod 8 via a mounting means X, and a cap support fitting 19 is clamped between the fastener 7 and the roof material 2a. Furthermore, a cap 20 long in a direction toward the eaves is externally coupled and connected to a plurality of the cap support fittings 19.