This invention is to improve the output image quality by drawing smart devices' light source in perpendicular direction to the optical axis. An endoscope for a mobile phone is attachable to smart devices in order to film internal parts of a subject; An endoscope for a mobile phone is composed of optic mechanism(5) in which an optic channel(4) is aligned along the axis of smart devices(2)' camera(3); and a light carrying mechanism(7) which draws the light emitted from smart devices(2)' light source(6) into the optic channel(4) of the optic mechanism(5) in order to perform as an endoscopic device.