To provide a hollow molding for preventing molding fault by completely inserting a blowing nozzle into a parison without deforming the parison in the case of insertion of the nozzle, and a method for manufacturing it.

The hollow molding of a hollow double wall structure formed integrally with a peripheral end wall 10 to form a hollow part 9 between opposed outer wall 7 and inner wall 8 by blow molding a parison 20 of thermoplastic synthetic resin is molded. A parting line 11 of a welded part between the wall 10 of the parison and inner wall 8 is formed at a peripheral end edge of the wall 8. A blowing nozzle 21 for blowing pressure fluid into the parison is inserted into a near site of the line 11 of the wall 8 of the parison. The fluid is blown from the nozzle 21 to be blow molded.