The present invention provides an endoscope apparatus, even a light guiding member for guiding light from a laser light source is broken, damage of outer implants can also be prevented, and maintenance can be carried out simply with a low cost. The periphery of an optical fiber (55) configured in an inserting portion of the endoscope and the inside of a general flexible cord to guide the light from the laser light source is covered with a photodiffusion tube (93) composed of multi-layer fiber groups (93-n). The photodiffusion tube (93) is composed of fiber members which are formed by polytetrafluoroethylene and formed with intervals. When the optical fiber (55) is broken to cause light leakage from the damaged portion, the light is diffused through the photodiffusion tube (93), thus hard light cannot be irradiated to the implants of the endoscope, and damage of the implants is prevented.
