Method for manufacturing a joint boot made of resin

摘要

In a joint boot (10) made of resin comprising a small-diameter cylinder part (12), a large-diameter cylinder part (14) and a bellows part (16) interlinking both and molded by injection blow molding, the small-diameter cylinder part constituting an injection molding section, the production of a burr at a boundary (X) between the injection molding section and a blow molding section will be suppressed. To that end, the boundary (X) at an outer periphery of the boot between the injection molding section and the blow molding section is set on a bellows part side away from a recess (20) for fixation of the small-diameter cylinder part (12). In particular, a shoulder portion (20c) of the recess (20) for fixation on the bellows part side is provided with a cutout portion (24), in which to set the boundary (X) between the injection and the blow molding sections.