PROBLEM TO BE SOLVED: To provide a turning slope device that is excellent in operability of storage and expansion and that can be easily attached to a vehicle and a step part.SOLUTION: A turning slope device comprises a base part 11, a flapper 12 that is coupled via a rotary part 13 in such a manner as to be freely turnable in a horizontal direction along a top surface of the base part 11, and a slope part that is coupled via a pivotal attachment part 14 in such a manner as to be freely turnable in a vertical direction with respect to the flapper 12.