An endoscope apparatus comprising: a video signal acquisition portion configured to image a test subject by a stereo optical system (2A, 2B) to acquire a video signal, the video signal including a first image and a second image that are simultaneously acquired through the stereo optical system (2A, 2B); a video signal processing portion configured to process the video signal to generate a display video signal; a measurement processing portion configured to acquire information on the position of a corresponding point on the first image and the second image corresponding to an input measurement point by a matching processing and calculate three-dimensional information of the input measurement point based on the acquired information on the position of the corresponding point; and a display portion configured to display the display video signal, wherein: the video signal processing portion is configured to generate a second display video signal by performing a process for dividing the first image and the second image of the video signal acquired by the video signal acquisition portion and generate a first display video signal by performing enlarging processing for one image of the first and second images (61L, 61R) divided at the time at which the second display video signal is generated; the endoscope apparatus is configured such that when an operation input for starting measurement processing by the measurement processing portion has been performed in an image display mode, the image display mode is changed into a measurement mode; and the display portion is configured to display the first display video signal as an image used to input the measurement point in the measurement mode. a video signal acquisition portion configured to image a test subject by a stereo optical system (2A, 2B) to acquire a video signal, the video signal including a first image and a second image that are simultaneously acquired through the stereo optical system (2A, 2B); a video signal processing portion configured to process the video signal to generate a display video signal; a measurement processing portion configured to acquire information on the position of a corresponding point on the first image and the second image corresponding to an input measurement point by a matching processing and calculate three-dimensional information of the input measurement point based on the acquired information on the position of the corresponding point; and a display portion configured to display the display video signal, wherein: the video signal processing portion is configured to generate a second display video signal by performing a process for dividing the first image and the second image of the video signal acquired by the video signal acquisition portion and generate a first display video signal by performing enlarging processing for one image of the first and second images (61L, 61R) divided at the time at which the second display video signal is generated; the endoscope apparatus is configured such that when an operation input for starting measurement processing by the measurement processing portion has been performed in an image display mode, the image display mode is changed into a measurement mode; and the display portion is configured to display the first display video signal as an image used to input the measurement point in the measurement mode. the video signal processing portion is configured to generate a second display video signal by performing a process for dividing the first image and the second image of the video signal acquired by the video signal acquisition portion and generate a first display video signal by performing enlarging processing for one image of the first and second images (61L, 61R) divided at the time at which the second display video signal is generated; the endoscope apparatus is configured such that when an operation input for starting measurement processing by the measurement processing portion has been performed in an image display mode, the image display mode is changed into a measurement mode; and the display portion is configured to display the first display video signal as an image used to input the measurement point in the measurement mode.