A fluid driving device includes a vibration unit, a signal transmission layer, a piezoelectric element, and a plane unit. The signal transmission layer includes a first conductive zone and a second conductive zone. The piezoelectric element includes a first electrode and a second electrode electrically isolated from each other. The first electrode of the piezoelectric element is electrically connected to the first conductive zone of the signal transmission layer, and the second electrode of the piezoelectric element is electrically connected to the second conductive zone of the signal transmission layer. The plane unit has at least one hole. The signal transmission layer, the piezoelectric element, and the plane unit are located at one side of the vibration unit and sequentially stacked with each other.