The present invention relates to roofing material to be connected with a further roofing material under a condition that respective sides of the roofing material and the further roofing material are overlapped with each other, including a main body having a substantially flat plate shape and a fitting part formed at an end of the main body. The roofing material further includes at least one positioning marker which is provided to the fitting part so as to indicate a position of an overlap between the respective sides.