The requirement for car parks is constantly growing and car parks have become higher and bigger. The quality and quantity of combustible materials in car parks is limited, and exterior wall and windows are not required. As a result, if a fire breaks out in this type of car park, the combustion type is not ventilation controlled one but fuel-storage-controlled fire type. Currently, car parks are designed based on the premise that a fire initiated in one car in a car park does not spread to the neighboring cars). However, this premise was arrived at on the basis of the results of experiments performed using the small car parks. In this study, in order to examine the hypothesis that a car fire initiated in one car in a large car park does not spread to neighboring cars, an experiment is conducted using a large-sized multistory car park by setting fire to a car in the parking lot. Contrary to the premise, the fire spreads from one car to another in succession.