1. A measuring endoscope apparatus comprising: an electronic endoscope comprising an image pickup unit; an image processing unit that receives an image pickup signal from the image pickup unit, the image processing unit generating an image signal from the image pickup signal; a control unit comprising a measurement processing unit, the measurement processing unit receiving the image signal from the image processing unit, the measurement processing unit performing a measurement process based on the image signal; a display unit that receives an output image from the control unit, the display unit displaying the output image; an observation image capturing unit that captures an observation image of an object; a sight display unit that displays a sight at coordinates that are positioned on the observation image, the sight representing a distance measuring point, the sight being superimposed on the observation image; a distance measuring processing unit that calculates an object distance from the distance measuring point, the calculation being made based on the observation image by using the principle of triangulation; and an object distance information display unit that displays information of the first object distance.