Industrial endoscopes can be used for observations at places under high temperature, toxicity, nuclear radiation and those invisible to naked eyes. They make it possible to easily and quickly examine the inside of various machines, equipment and assemblies without dismantling and disrupting them to carry out effective quality control, and play an important role even in research, development and manufacture activities. This product can be coupled with a cemera, pickup camera or computer to form a photographing, pickup or image processing system for object monitoring, recording, storage and image analysis, thus finding wide applications in various modern industries such as aviation, automobile, marine, electricity, electronics, chemical, gas, atomic energy and civil construction fields.