A step apparatus includes a step body that can move between a projecting position where the step body projects from a side surface of the vehicle and a retracted position where the step body is retracted behind the side surface of the vehicle, a drive unit for driving the step body, the drive unit including a rope-shaped member connected to the step body, a rotating drum around which the rope-shaped member is wound, and a drive motor that rotates the rotating drum, and a guide unit for guiding the movement of the step body between the projecting position and the retracted position.