To propose a method for manufacturing a double container that suppresses the increase in the number of steps associated with initial exfoliation processing, which can lead to a reduction in manufacturing cost and manufacturing time.SOLUTION: The present invention relates to a method for manufacturing a synthetic-resin made double container including a step of blow-molding a preform 1 having an outer layer part 7 and an inner layer part 8, the double container comprising: an outer layer body having a cylindrical mouth part, being a bottle shape, and being formed by the outer layer part; an inner layer body deformable as volume reduces, and formed by the inner layer part; and an external air introduction port provided at the mouth part and communicating between the outer layer body and the inner layer body. The blow molding step includes the steps of: supplying pressurized gas with equal to or more than a...

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