PURPOSE: To enable simultaneous construction at the time of roofing operation and to make an external appearance of the titled roof not to differ from a conventional metallic roof, by incorporating a solar heat collector within the metallic roof.

CONSTITUTION: A water pipe 3 is provided within a plurality of protruded stripe parts 2 extending from the ridge part of a metallic roofing material 1 roofed over the ridge to eaves. The metallic roofing material 1 is constituted with a thin plate 8, a hanger 9 and a cap 10 and rain water is prevented from intruding by covering the hanger 9 over with the cap 10. As the water pipe 3 is hidden within the protruded stripe part 2 of the metallic roofing material 1 and a water supply pipe 4 and a water collecting pipe 5 are hidden by a eaves edge cover 6 and a ridge side cover 7 respectively like this, it becomes that the titled roof hardly differ with a conventional metallic roof from an external appearance point of view and it does not happen that a solar heat collector comes off and falls down from the roof even if strong wind blows.