An endoscope device includes an optical coupler, an image pickup module, a second bundle of optical fibers, a photodetector and an image processing module. The optical coupler has an input end optically coupled to a light source, a first output end and a second output end. The image pickup module includes a lens module and a first bundle of optical fibers. A end of the first bundle of the optical fibers is optically coupled to the output end of the optical coupler. An opposite end of the first bundle of the optical fibers is configured for emitting the light to illuminate an object. The second bundle of optical fibers has a end optically coupled to an image side of the lens module. An opposite end of the second bundle of the optical fibers and the second output end of the optical coupler are optically coupled to the photodetector.