Abstract: A roller coaster device which can operate a seat together with a car to perform a perpendicular running motion such as vertical descent, vertical ascent, vertical spiral motion and the like, or in such a manner as to run backwards. The device significantly increases thrill and interest levels by creating the sensation that the endless running rail suddenly disappears from the view of the occupants in the roller coaster device. The device can be configured in a small space and in a compact manner. A car (4) is mounted on the endless running rail (1) having a desired length that is provided in a rolling and bending manner through rollers (6) so as to run freely while being held thereto, and seats (11a, 11b) are suspended on the car 4 by mounting members (12a, 12b) so as to rotate freely.