An oscillator apparatus for sorting out pieces of lumber for separating smaller scraps of wood from larger usable pieces of wood. The first internal electrodes are connected to each other, and the second internal electrodes are connected to each other, via through holes that penetrate the piezoelectric layer in the laminated direction. In liquid suction device, the suction nozzle is moved by the driving unit until the tip opening contacts a bottom surface of the well while the suction nozzle applies a suction force produced by the suction pressure, thereby enabling suction of the liquid from the well andor the microchannel. The gate insulator is disposed over the gate.