Molded article manufacturing method

A manufacturing method of a molded product, comprising:

• a measurement step;
• a correction step;
• and a burr cutting step,
• wherein, in the measurement step, a position of at least one point on a peripheral surface of a molded body is measured while the molded body is in a positioned state,
• in the correction step, a master cutting line is corrected on the basis of a measurement result in the measurement step to determine a corrected cutting line, and
• in the burr cutting step, a burr provided on the peripheral surface of the molded body is cut according to the corrected cutting line,
• wherein, in the measurement step, an expansion and contraction amount of the molded body is measured, and
• in the correction step, the expansion and contraction amount of the master cutting line is corrected on the basis of the measurement result in the measurement step,
• wherein the expansion and contraction amount is corrected by parallel transport of a portion of a cutting line before correction.