The invention provides a hearing aid device for assisting people with hearing disorder to obtain hearing information. The hearing aid device comprises a bone conduction transcriver, a receiver and a driver. The bone conduction transcriver converts sound raw data into corresponding bone conduction signal. The receiver is installed in an inner ear part of the people with hearing disorder, and the receiver receives bone conduction signals and converts the bone conduction singals into a sound reduction signal. The driver sends a physical signal according to the sound reduction signal, so that the people with hearing disorder can obtain an acoustic signal.