The present disclosure provides an acoustic device. A vibrating diaphragm includes an edge and a damper for fixing and supporting the edge, where the damper includes a middle dome and a circuit board for fixing and supporting the middle dome, the fixing part of the circuit board is provided with a conductive part electrically connected to a voice coil lead; and an orthographic projection of the middle dome on the circuit board is not overlapped with the conductive part. The orthographic projection of the middle dome of the acoustic device on the circuit board is not overlapped with the conductive part during spot welding between the circuit board and the voice coil, therefore the problem of a short circuit of an aluminum foil dome caused by the fact that the circuit board is broken down due to overhigh spot welding temperature and pressure can be avoided.