PASSENGER-SEAT-CUSHION-MEMBER MANUFACTURING METHOD, PASSENGER-SEAT CUSHION MEMBER, FILLING-BODY MANUFACTURING METHOD, AND FILLING BODY

A passenger-seat-cushion-member manufacturing method including a step of shaping the porous structural body by using a 3D printer; and a step of coupling the filling body side coupling part including the shaped porous structural body to the seat body side coupling part, to fill the seat body with the filling body.