A latch mechanism includes a bracket (30) for receiving a data storage device (10) therein, a latch member (30), and a locking member (20) fixed to a rear end of the data storage device. The bracket includes a pair of hooks (35), and a pair of fixing tabs (37) extending from a bottom wall (31) thereof. The fixing tabs each define a pivoting hole (371) therein. The locking member includes a pair of cutouts (24) for engaging with the hooks, and a folded flange (26). The latch member includes a base wall (41), and a pair of sidewalls (42) extending from an end of the base wall. The sidewalls include a pair of shafts (422) engaging in the pivoting holes of the bracket. The base wall includes a block engaging with the folded flange of the locking member, and a pair of resilient arms (43) engagingly abutting against the bottom wall of the bracket.