A videoscope includes: an imaging device having at least one monitoring subject pixel each of which produces, frame by frame, a normal detection value or an abnormal detection value, normal pixels and at least one defective pixel a memory which is stored with a position address of each of the at least one monitoring subject pixel and an image processing unit which performs image processing on image signals produced by the imaging device so as to judge, in each frame, based on information stored in the memory, whether each of the at least one monitoring subject pixel has produced a normal detection value or an abnormal detection value and to correct the detection value of each of the at least one monitoring subject pixel using detection values of nearby normal pixels only in frames in which an abnormal detection value is produced.
