Ramp for accessing vehicles

A ramp for accessing vehicles comprising a casing (1) open at one of its walls which is closed by means of a folding door (3) and in which a platform (8) extractable through the open wall, as well as a mechanism responsible for shifting said platform between extraction and retraction position are housed. The platform is connected by its rear edge to the extraction mechanism by means of a hinge (16) which is outside the casing in the maximum platform extraction position. The bottom portion of the platform (8) rests on rolling elements housed in the casing (1).