An endoscope apparatus includes: a reference image generating section that generates a reference image to be used for determining whether an inspection object is non-defective or defective; and a mixer that outputs the reference image in a superimposed manner on an endoscopic image from an endoscope, the endoscopic image being obtained by photographing the inspection object, in a predetermined inspection mode, and an image of the inspection object and the reference image are displayed in a superimposed manner, to thereby facilitate a non-defective/defective determination and improve an operability in an inspection.