A mobile communication device is provided. The mobile communication device includes a display, a supporting member disposed under the display and having a hole, and a vibration actuator attached to the supporting member, where the vibration actuator does not overlap the hole when seen substantially perpendicular to the display, and where at least a portion of a region surrounding the hole of the supporting member is vibrated by vibration generated from the vibration actuator, whereby a sound signal having a predetermined frequency to be used for voice communication is generated.