To provide a method for stably producing high-quality glass gob free from shear marks, folds, striae, etc., by casting a mold with molten glass running out continuously from a conductor outlet under the delay control of the next glass's free fall following cutting a glass flow.

The diameter of a conductor outlet port is designed to be 1.2-3.0 times that of the conductor proper, thus making a molten glass flow continuously running out following cutting off the preceding glass flow stay at the conductor outlet and enabling delay control of the initiation of molten glass's free fall. Owing to this method, the objective unconventionally high-quality glass gob can be produced stably and efficiently.