A hard disk drive holding device adapted for holding a hard disk drive, the hard disk drive having a front face, a rear face that is opposite to the front face, two side faces, two apertures that are formed respectively on the side faces, and a guiding hole that is formed on the front face, said hard disk drive holding device comprising:
- a support frame including a front part that is adapted to abut against the front face, two side arms that are connected respectively to two ends of said front part, and a guiding part that is formed on said front part and that is adapted to extend into the guiding hole;
- and
- a holding member made of a flexible material, said holding member including a connecting part and two holding arms that extend respectively from two ends of said connecting part and that are connected respectively to rear ends of said two side arms distal from said front part, each of said holding arms having a projecting portion that is adapted to engage a respective one of the apertures.