A hard disk device frame for fastening a plurality of hard disk devices, a fan, and a main board is disclosed. The hard disk device frame includes a rotary piece, a back chassis, and plural hinges. The rotary piece includes a front chassis having an opening; and a bracket fixed on the front chassis, wherein the hard disk devices enter the opening and couple to the bracket. The fan and the main board are fixed on the back chassis. The hinges connect the front chassis and the back chassis, thereby the rotary piece is pivoted relative to the back chassis to hide or expose the fan and the main board on the back chassis.