A frame has a notch having an opening at a side plane of the frame. A diaphragm is vibratably attached to one plane of the frame. A voice coil is attached to the diaphragm. A terminal is attached to the other plane of the frame. A lead is connected to the voice coil, drawn from one plane to the other plane through the notch, and connected to the terminal. One of intersection points at which a normal to the side plane that passes through the position of the lead in the notch and the side plane intersect that is closest to the opening and the lead in the notch are intervened therebetween by the frame.