Waterproof structure in cable insertion section, method of manufacturing the same, and die for waterproof molding

A method of manufacturing a waterproof structure in a cable insertion section, wherein an inner peripheral surface of the cable insertion section and an outer peripheral surface of a cable member are sealed together in a cable-inserted state in which connector terminals of cable members connected to ends of individual conductors are inserted into the cable insertion section formed in a housing body and are provided at predetermined positions, the method comprising the steps of:

• inserting the cable members into a elastically deformable annular sealing body movably to realize the cable-inserted state;
• detachably fitting a plug into the cable insertion section with a slight gap between the inner peripheral surface of the cable insertion section;
• molding the plug on the outer peripheral surfaces of the cable members situated in the cable insertion section to form a retention groove for holding the sealing body being in an outer peripheral surface of thereof;
• and
• fittingly squeezing the plug into the cable insertion section while the sealing body is retained in the retention groove in the molded plug to bring the sealing body into close contact with the inner peripheral surface of the cable insertion section.