A fixing structure capable of adjusting the dimensions in the vertical direction of a vibration generating device including a circuit board in combination with the circuit board without reducing the size or the diameter of the vibration generation device. A fixing holder in a holder shape for holding or including at least a part of the outer circumference of a vibration generating device has an inner circumferential surface substantially identical to the external shape of the vibration generating device. Groove-like rail parts are provided partially in the outer circumferential surface of the holder at the opposite ends thereof in the same linear direction, and the side end part of a notched circuit board or a part on the housing side of the apparatus is inserted into each of the groove-like rail parts, thus holding and securing the vibration generating device at an arbitrary vertical position against the surface of the circuit board in the apparatus.