PROBLEM TO BE SOLVED: To provide a road surface crossing slope detection device that can prevent a crossing slope amount of a road surface from being detected as a value greatly deviated from a real crossing slope amount when a vehicle straight-traveling the road with irregularities existing on the road surface.;SOLUTION: A road surface crossing slope detection device includes: multiple marks 18a, 18b applied to an inner face of a target tire 15b being at least one wheel of a vehicle and being a tire of a target wheel; straight traveling determination means for determining whether or not the vehicle straight-travels on the road surface of the road grounded by the target tire; a camera 17 provided at the target wheel and imaging each mark; irregularity determination means for determining whether or not irregularities are present on the road surface, based on the imaging data of the camera; and crossing slope amount calculation means for calculating a crossing slope amount of the road surface, based on the imaging data of the camera, when the straight traveling determination means determines that the vehicle straight-travels and the irregularity determination means determines that the irregularities are not present on the road surface.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2019,JPO&INPIT
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