A mobile communication device has a main body, a display unit, an input unit. The display unit is pivotally connected with the body unit by a joint, which is located on a rim of the display unit. The input unit has a lower input module and an upper input module. The lower input module is disposed on the main body. The upper input module is pivotally connected with the lower input module by a joint, located on a rim of both the upper input module and the lower input module.