Clamp member and hard disk drive device

A hard disk drive device, comprising:

• a housing;
• a spindle motor disposed inside the housing;
• a recording disk disposed inside the housing and rotated by the spindle motor;
• a clamp member disposed inside the housing, configured to fix the recording disk to a rotating part of the spindle motor, and having a disk shape;
• and
• an access part disposed inside the housing and configured to record data on the recording disk and read data recorded on the recording disk, wherein
• the clamp member comprises
• a clamp lower surface provided in an outer edge region of the clamp member, contacting an upper surface of the recording disk, and configured to apply a downward force to the upper surface,
• a plurality of first through holes provided at a first interval in a circumferential direction in a first region at an inner side in a radial direction from the outer edge region, fastening members to be fastened to the rotating part being inserted into the first through holes;
• and
• a plurality of second through holes provided at a second interval in the circumferential direction in a second region at an inner side in the radial direction from the first region, the fastening members being inserted into the second through holes.