A data recording/reproducing apparatus that includes an open front housing having a base frame and a cover frame, a recording/reproducing unit installed in the housing to record and/or reproduce data from a predetermined recording medium, a circuit board installed parallel to the recording/reproducing unit in the housing, a front unit connected to the open front of the housing to support operation buttons, a first locking unit which locks the front unit and the recording/reproducing unit, and a second locking unit which locks the front unit and the housing at a position corresponding to the circuit board.