A vibration device includes a piezoelectric element and a vibration member. The vibration device is arranged to be supported on a base. The vibration member includes a first main surface opposing the base and a second main surface opposing the first main surface. The piezoelectric element is disposed on the second main surface. The first main surface of the vibration member is provided with a protrusion contacting the base and defining a vibration space on the first main surface. The protrusion is positioned outside the piezoelectric element to surround the piezoelectric element when the vibration member is seen through from a direction orthogonal to the first main surface.