A magnetic recording device comprises, spindle means for supporting a magnetic record disk thereon, the spindle means rotated to rotate the magnetic record disk thereon, bearing means for supporting rotatably the spindle means to rotate the magnetic record disk, the bearing means including a radial bearing portion for supporting the spindle means in a radial direction of the spindle and an axial bearing portion for supporting the spindle means in a longitudinal direction of the spindle at a longitudinal end of the spindle means, and magnetic head means for magnetizing or demagnetizing portions of the magnetic record disk so that the informations is output from the magnetic record disk or is input thereinto, the magnetic head means moving on the magnetic record disk in the radial direction of the spindle means so that a wide radial surface of the magnetic record disk is used for recording the informations.