An endoscope apparatus, includes: an explosion-proof unit that has an image pickup device that outputs photographed video images as video image signals and an A/D converter that converts the video image signals into digitalized image signals a control unit that controls the explosion-proof unit and an energy limiting circuit that is provided at the control unit and that limits electrical energy of digital signals to satisfy intrinsic safety when sending and receiving of the digital signals, wherein the explosion-proof unit is connected to the control unit via the energy limiting circuit with a signal line.
