Subject distinguishing unit distinguishes the subject in this uneven pattern on the surface of the subject. A subject distinguishing unit, the transparent unit that includes a support surface for supporting the subject; Light irradiating unit for irradiating illumination light (illumination light) on a surface of the object through the transparent unit; Imaging unit for imaging the imaging area including at least part of the transparent unit and generating image data; And using the image data generated by the imaging unit, it comprises a discrimination processing unit to distinguish the subject. The distinguishing processing unit is based on the distinct image data generated by correcting the object image data using the correcting image data to distinguish the subject. The subject image data is the subject is generated by sensing the sensing area in a state in which the image pickup area. The corrected image data is generated by sensing the sensing area in the absence of the subject within the imaging region.