Funnel component and manufacturing method for manufacturing packaging container using funnel component

A manufacturing method for manufacturing a packaging container having a funnel component that is formed of a first sheet member including paper and a first sealant and includes:

• a funnel portion having a diameter reduced from a wide opening side toward a narrow opening side;
• and a side wall portion that connects to a wide opening side portion of the funnel portion and surrounds an outer surface of the funnel portion, the manufacturing method comprising:
• forming a cup-shaped container body having a cylindrical side wall, a bottom portion, and an open end, the forming the container body including:
• forming a cup-shaped intermediate product having:
• a cylindrical side wall formed of a second sheet member that includes paper and a second sealant;
• a bottom portion formed of a third sheet member that includes paper and a third sealant;
• and an open end;
• forming a first curling portion by curling an open end portion of the side wall of the cup-shaped intermediate product outward;
• softening the second sealant by heating a portion, on a bottom portion side, of the first curling portion;
• forming a second curling portion by further curling outward the first curling portion having the second sealant softened;
• and
• forming a flange portion by pressing the second curling portion;
• and
• inserting the funnel component through the open end of the container body to face the wide opening side portion of the funnel component toward the bottom portion of the container body, and joining an outer surface of the side wall portion to an inner circumferential surface of the container body.