<p>An underwater telephone device (100) comprises a receiver (17a) for receiving voice data transmitted from the exterior, a bone conduction speaker (12) for outputting vibrations corresponding to the voice data received by the receiver (17a), and a mounted part (10) mounted on a diver such that the bone conduction speaker (12) is made to be in contact with the diver. The bone conduction speaker (12) is attached at a distance from the mounted part (10) via an elastic body.</p>
