OPTICAL FIBER TAPE CORE WIRE MANUFACTURING METHOD, MANUFACTURING DEVICE, AND OPTICAL FIBER TAPE CORE WIRE AND OPTICAL FIBER CABLE MANUFACTURED WITH SAID MANUFACTURING METHOD

Provided is an method of manufacturing an optical fiber tape core wire with which, even when the optical fiber tape core wire is separated into optical fiber wires, it can be determined which optical fiber tape core wire each optical fiber wire is associated with. A fiber running length adjustment device 13 adjusting the running lengths of the optical fiber wires 2 running from printers 8 (8A to 8D) to a tape forming device 11 is used to adjust the running lengths of all the optical fiber wires 2 between the printers 8 and the tape forming device 11 to a same length. By this adjustment, markings 6 formed on each optical fiber wire 2 (2A to 2D) can be aligned with the corresponding markings 6 formed on the other fiber wires 2 to the same position.