1. An endoscope apparatus comprising: an electronic endoscope for capturing a measurement object and producing a picked-up image signal; an image-processing unit for producing an image signal based on the picked-up image signal; and a measurement processing unit for conducting a measurement processing on the measurement object based on the image signal, wherein the measurement processing unit is provided with: a reference point-designating unit for designating two reference points on the measurement object; a loss-composing points-calculating unit for calculating loss-composing points that constitute a loss outline formed on the measurement object based on the reference point; and a loss-measurement unit for measuring loss size based on the loss-composing points.