A novel plastic image-transmitting fiber (PIF) has been developed to meet the demand for improved optical fibers used in endoscopic applications. This fiber has a circular cross- sectional diameter of approximately 0.5 mm consisting of about 3,000 fiber elements corresponding to as many pixels when the image is represented using an appropriate display mechanism. The resolution, as measured by the USAF Test Target Method, is greater than 50 lp/mm. The flexural elastic modulus is 350 kg/mm2, less than one-tenth of the value for silica fibers. And, flexural endurance tests indicate that the minimum bending radius is 2 mm under repeated bending.