A manufacturing method of a composite container according to the present invention is characterized by preparing a paper label (3), and a preform (4); preparing a molding die (10) equipped with a closed, cylindrical lower mold (11), and an upper mold (12) composed of a plurality of split-mold segments (13, 14); next, in addition to arranging the paper label (3) in the lower mold (11), arrange the preform (4) from a direction that intersects an axis (A1) between the opened split-mold segments (13, 14), and thereafter move one or both of the lower mold (11) arranged with the paper label (3), and the upper mold (12) arranged with the preform (4) in a direction towards each other. After that, implement blow-molding on the preform (4) by closing a molding die (10), then opening the molding die (10) to release the composite container from the molding die (10).