Provided is a liquid blow molding method for molding a bottomed tubular-shaped preform (2) into a liquid-containing container (60) in which a content liquid (L) is held. The liquid blow molding method includes: a filling step of filling a first liquid (L1) in a first pressurizing source (32) and filling a second liquid (L2) in a second pressurizing source (35); and a molding step of liquid blow molding the preform (2) by simultaneously supplying, to the preform, the first liquid (L1) pressurized to a predetermined pressure by the first pressurizing source (32) and the second liquid (L2) pressurized to a predetermined pressure by the second pressurizing source (35) by simultaneously operating the first pressurizing source (32) and the second pressurizing source (35).
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