Fluid device

A fluid device comprising a fluid chamber which is designed for receiving a fluid and which is commonly delimited by a device housing and a bending-elastic membrane element which has a planar extension in a main extension plane, wherein the membrane element at its peripheral edge region is fixed to the device housing and wherein a membrane working section of the membrane element which is framed by the peripheral edge region, for the change of the volume of the fluid chamber is elastically deflectable in a working direction which is orientated transversely to the main extension plane by a piezoactuator of the fluid device whilst carrying out a stroke movement, wherein the piezoactuator comprises an electrode arrangement, to which an operating voltage which creates the stroke movement of the membrane working section can be applied in a variable magnitude, and wherein the membrane element is a functional constituent of the piezoactuator by way of said membrane element directly forming an electrically conductive electrode of the electrode arrangement.