An immobilizing device for biological material comprises a rigid support carrying a substrate layer of polymer having biological immobilizing properties, e. The wiring unit has a substrate, an individual supply-terminal group which includes a plurality of individual supply-terminals, a common supply-terminal, and an isolative covering layer, which is stacked on a surface of the substrate facing the piezoelectric unit. Each element corresponds to a pixel of an image. IF 7 enabled and permits the output of a digital signal.