An electronic device and a key coupling unit therefor are disclosed. The key coupling unit includes a key configured in a specific shape, a key guide frame configured to guide pressing of the key, and a key circuit board configured to input a signal corresponding to the pressing of the key. The key coupling unit is fixed in a settling area of a bracket. A bumper is formed to protrude from the lower part of the key circuit board. A pressing part is formed in the bracket to face the bumper of the key circuit board. A command signal of a corresponding key is transmitted to the key circuit board by converting to an electric signal if the bumper presses the pressing part. The bumper and the pressing part are located by moving in a lateral direction from the center of the settling area of the bracket.