A disk device including a frame body having an outer wall, a recording disk located for rotation inside the frame body, a recording and reproducing head, and an actuator for driving the head for recording and reproducing information on and from the disk. The actuator includes a voice coil motor including a pair of yokes opposed to each other with a predetermined distance therebetween, a movable coil wound to be movable between the yokes, and a permanent magnet attached to at least one of the yokes to add a magnetic field to the movable coil, wherein a portion of the outer wall of the frame body includes a first one of the yokes, and the frame body includes an open side opposite a side where the disk is located and an inside portion including screwing margins and screws for attaching the first yoke to the open side.