According to some embodiments, an amplifier may include a transconductance stage, a tail current source stage, and an adaptive biasing stage. A concave portion facing a posterior edge of the particle filling opening is brought into communication with external space through the communication part. Thus, the breakdown voltage at the junctions between the extracting regions and the sourcedrain regions is increased and a parasitic bipolar effect is suppressed without breakdown between the extracting regions and the sourcedrain regions. Thereby, there is no movable part and thus it eliminates a need for providing the external device with software processing for calculating the relative location of the partial fingerprint images, thereby achieving downsizing and power saving of the apparatus.