A cognitive impairment diagnostic apparatus (1) includes: a display (10) which displays a video for diagnosis of cognitive impairment on a display surface (11)； an imaging unit (21) which captures images of an eye of a subject； a detection unit (37) which detects viewpoints of the subject on the display surface (11) in time series based on the images captured by the imaging unit (21)； a creation unit (38) which creates a distribution map representing a distribution of the viewpoints detected by the detection unit (37)； a storage unit (32) which stores case characteristic data (310) indicating a characteristic of a viewpoint distribution corresponding to a typical case in cognitive impairment； and a diagnostic unit (39) which diagnoses cognitive impairment of the subject by determining whether the distribution map has the characteristic indicated by the case characteristic data.
