Abstract: The present invention relates to a car providing a sliding door comprising guide rails mounted along an entry opening formed on the front half section of a car body and a sliding door used as a front door to be slid through a roller assembly to be engaged with each guide rail when it is opened or shut. In this car, the sliding amount of the sliding door is regulated so as to disable the rear end of the sliding door to be projected from the rear end of a car body when it is opened. And, in order to enable the entry opening opening to be fully opened, an auxiliary handle is providced in addition to an outside handle and an inside handle. Further, the invention also relates to improvement of opening or shutting mechanism and structure of the sliding door.