Abstract: A multi-story parking facility comprises a double helical descending ramp structure in the shape of a rectangle, a pair of ascending ramps located on each side and sandwiching the double helical descending ramp structure therebetween, and a pair of connecting passages provided on each floor for connecting the double helical descending ramp structure and the ascending ramps. The ascending ramps are provided with parking spaces on one or both sides thereof. The pair of connecting passages provided on each floor are positioned symmetrically about the center of the descending ramp structure. The above configuration permits speedy entry and exit of cars to realize a high turnover and accommodation efficiency.