To provide a roof structure capable of preventing the surface of a roof from being overheated in the summer season, capable of being easily fixed to the substrate surface of the roof, and capable of providing an excellent attractiveness with shading.

In this rood structure, a plurality of roof materials 2 having water holdability are placed on roofboards 11 covered with waterproof sheets 12 and subjected to a waterproofing treatment, the down water side locking pieces 43 of fixtures 4 fixed to the roofboards 11 are locked to grooves 21 provided in the upper water side end faces of roof materials 2 on the down water side adjacent to each other in the eave direction, and the upper water side locking pieces 42 of the fixtures 4 are locked to the grooves 21 provided in the down water side end faces of the roof materials 2 on the upper water side adjacent to each other. The upper water side locking pieces 42 of the fixtures 4 are provided at positions higher than the down water side locking pieces 43.