PURPOSE: To absorb a falling impact by attaching a central part of a holder to a frame rotatably, providing a bended part on the lower edge part of the holder and interposing an elastic member between the bended part and the frame.

CONSTITUTION: When a floppy disk device 10 is attached to a host device through the holder 2, the holder 2 is fixed to the frame 1 by a screw 6 with step, and the holder 2 is screw fixed to an attaching hole provided on the attaching bracket of the host device through a screw hole 3 while positioning so that two pieces of elastic members 5 are in contact with the frame 1 nearly uniformly. Thus, even when a relative position between the screw hole of the holder and the attaching hole of the attaching bracket of the host device is shifted, the distortion is absorbed by the elastic member, and the deformation of the frame is prevented. Further, even when the falling impact is applied, since the impact is absorbed by the elastic member, is not transmitted to a floppy disk.