In a flexible disk drive for a flexible disk, a main frame defines a receiving portion for receiving the flexible disk. The main frame has a principal surface which faces the receiving portion and extends in a first direction and a second direction perpendicular to the first direction. A carriage assembly is mounted on the main frame and has a magnetic head for accessing the flexible disk. The carriage assembly is movable to carry the magnetic head along the principal surface. An eject base is coupled to the main frame and has a main portion facing the principal surface and side plates opposite to each other in the first direction. Between the main frame and the eject base, an eject plate is placed movable in the second direction for ejecting the flexible disk from the receiving portion. The eject plate has side plates facing the side plates of the eject base in the first direction, respectively. A guiding mechanism is coupled to the side plates of the eject base and to the side plates of the eject plate and guides movement of the eject plate in the second direction.