Only individual piece-like flexible wiring boards produced separately and judged to be non-defective products in an inspection step in advance are mounted at regular intervals on a carrying support film to thereby obtain a TAB tape carrier. According to this method, the yield on continuous production can be improved while the step of replacing defective flexible wiring boards found by inspection with non-defective flexible wiring boards can be omitted after mounting of the flexible wiring boards. A difference in level between the respective flexible wiring boards can be prevented from being caused by the replacement, so that high connection reliability can be ensured.