A fluid sending apparatus (A, B, C) comprising: at least one driving mechanism that includes a diaphragm to apply sending force to fluid, the driving mechanism vibrating the diaphragm; and a signal generator that generates a signal to vibrate the diaphragm and transmits the signal to the driving mechanism, wherein the signal generator forms the signal such that the signal includes a signal component having a one-sided waveform and being composed of a rising component in a positive voltage direction, a falling component in the positive voltage direction, and a formation time component of time existing between the rising component and the falling component, the signal component having a waveform only for one period, and a negative voltage damping component for driving for a predetermined time with a voltage that is less than or equal to one-half of a voltage in the positive voltage direction, the damping component having a waveform only for one period; characterized by that: the fluid sending apparatus further comprises: one or more vibrating units including a diaphragm and a first elastic member in combination, the diaphragm and the first elastic member being different from those of the driving mechanism, wherein one or two or more of the vibrating units are arranged in a space at a front of the driving mechanism and a rear surface of each of the vibrating units is connected through an acoustic path to a front surface of the driving mechanism, and the acoustic path is a route that is defined by partition members arranged in the space and extends from the driving mechanism to a corresponding vibrating unit. at least one driving mechanism that includes a diaphragm to apply sending force to fluid, the driving mechanism vibrating the diaphragm; and a signal generator that generates a signal to vibrate the diaphragm and transmits the signal to the driving mechanism, wherein the signal generator forms the signal such that the signal includes a signal component having a one-sided waveform and being composed of a rising component in a positive voltage direction, a falling component in the positive voltage direction, and a formation time component of time existing between the rising component and the falling component, the signal component having a waveform only for one period, and a negative voltage damping component for driving for a predetermined time with a voltage that is less than or equal to one-half of a voltage in the positive voltage direction, the damping component having a waveform only for one period; a signal component having a one-sided waveform and being composed of a rising component in a positive voltage direction, a falling component in the positive voltage direction, and a formation time component of time existing between the rising component and the falling component, the signal component having a waveform only for one period, and a negative voltage damping component for driving for a predetermined time with a voltage that is less than or equal to one-half of a voltage in the positive voltage direction, the damping component having a waveform only for one period; characterized by that: the fluid sending apparatus further comprises: one or more vibrating units including a diaphragm and a first elastic member in combination, the diaphragm and the first elastic member being different from those of the driving mechanism, wherein one or two or more of the vibrating units are arranged in a space at a front of the driving mechanism and a rear surface of each of the vibrating units is connected through an acoustic path to a front surface of the driving mechanism, and the acoustic path is a route that is defined by partition members arranged in the space and extends from the driving mechanism to a corresponding vibrating unit. one or more vibrating units including a diaphragm and a first elastic member in combination, the diaphragm and the first elastic member being different from those of the driving mechanism, wherein one or two or more of the vibrating units are arranged in a space at a front of the driving mechanism and a rear surface of each of the vibrating units is connected through an acoustic path to a front surface of the driving mechanism, and the acoustic path is a route that is defined by partition members arranged in the space and extends from the driving mechanism to a corresponding vibrating unit.