To provide a roof structure in which a photovoltaic panel P is provided on a roof of a parking lot with diagonal parallel parking.SOLUTION: In a parking lot where a plurality of vehicles M are obliquely stopped in parallel along a certain direction, pillars 10 are erected in a zigzag shape at the width of the car parked diagonally on both sides in a certain direction. A short direction beam 20 is provided between the pillars 10 on both sides, and a long direction beam 30 is provided between the pillars 10 in a certain direction. A photovoltaic panel is provided on a purlin 31 provided between both long direction beams 30 so as to be substantially orthogonal to the long direction beams 30. The parallel direction of the rectangular photovoltaic panels matches with the length direction or short direction of the purlin 31. The purlin 31 is positioned over the entire length in the short or long direction of the photovoltaic panel. A disk-shaped end plate is fixed on the pillar 10 which is a steel pipe cylindrical pillar. A structure in which the ends of both beams 20 and 30 are fixed to the periphery of the disc-shaped end plate is adopted so that the beams 20 and 30 can be fixed in any direction around the pillar 10 by welding or the like, and the angle is not limited to the parallel oblique angle θ of the vehicle.SELECTED DRAWING: Figure 4
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