A solar panel mounting structure includes: a fixation member as an angle member firmly fixed onto a roofing composed of a metal plate as a magnetic material; solar panels, each of which is rotatably held on the fixation member while interposing an insertion/extraction hinge mounted on an upper edge of an erected portion of the fixation member; and a magnetic engaging device provided between the solar panel and the roofing in order to detachably fix the solar panel to the roofing. The fixation member is firmly fixed to the roofing while interposing a double-sided adhesive tape and an adhesive agent therebetween. The magnetic engaging device includes: a cup-like casing mounted to a lower surface of the solar panel by a screw; and a ferrite magnet firmly fixed into the casing.