A bezel mounting assembly includes a bezel (10), a front panel (30) defining a pair of apertures (31), and a locking device (20) attached to the bezel for securing the bezel to the front panel. The bezel includes a pair of pillars (121) and a pair of blocks (11) having a pair of posts (14). The locking device includes a pair of symmetric side plates (22) defining through slots (25) for slidably receiving the posts, a pair of resilient arms (27) extending from the side plates, an operating member (23), and a pair of catches (26). The locking device is slidably attached on the blocks, with the posts engagingly received in the through slots. The resilient arms are secured to the pillars at free ends thereof. The operating member is moved vertically so as to drive the catches to engage in and disengage from the apertures of the front panel.