To provide a non-slip-off-of-snow type roof structure which eliminates snow, accumulated on a roof, without making the snow slip off the roof.

In this roof structure, a width-direction side edge is protruded upward to form a snow guard part P having a fitting structure; the part P of a long roofing material A, wherein a recessed part 11 is provided between the parts P, is fitted for fixation in such a manner as to be made approximately horizontal, so that the roofing materials A can be fixed to a substrate α; and a snow-melting member H is formed at least at an end part of the part P of the roofing material A near eaves.