In a mobile station, a casing has a sound hole formed in a front wall portion thereof, and an inner frame is contained in the casing. A sound duct is integrally formed with the inner frame, and a wiring board is contained in the casing and arranged In the vicinity of a bottom wall portion of the casing. A sound speaker is mounted on a top surface of the wiring board such that a sound emitting face of the sound speaker is directed to the front wall portion of the casing. The sound emitting face of the sound speaker is connected to the sound hole through the sound duct so that a sound is guided from the sound speaker to the sound hole.