Disclosed is an anterior ocular segment observation device for observing the state of a corneal endothelium in detail. The anterior ocular segment observation device (100) creates a three-dimensional image of the anterior ocular segment of an eye to be examined using an OCT of full-field type. An image region identifying unit (242) analyzes the three-dimensional image and identifies the corneal endothelium region corresponding to the corneal endothelium of the anterior ocular segment. An abnormality determining unit (246) analyzes an image region including the corneal endothelium region and a region around the corneal endothelium and determines whether or not there is an abnormality of the boundary surface of the corneal endothelium, the layers within the cornea, and corneal endothelium cells as an abnormality of the corneal endothelium. A storage unit (244) stores the result of the abnormality determination therein, and the abnormality determining unit (246) compares the new result of the abnormality determination about the eye to be examined with the past result of the determination stored in the storage unit (244) and obtains temporal variation information relating to the corneal endothelium. The storage unit (244) stores disease information (245) therein in advance, and the abnormality determining unit (246) identifies the name of the disease corresponding to the result of the abnormality determination on the basis of the disease information (245).
