A method for manufacturing a baseless incandescent lamp assembly comprises a step for molding a conductive plate material into a continuous holding member chain including a number of facing pairs of holding members on both sides of a belt-like coupling section, a holding step for causing a flattened seal section of a baseless incandescent lamp to be held between the paired holding members, a step for cutting off the paired holding members from the coupling section while keeping the flattened seal section of the baseless incandescent lamp between the holding members, and a step for inserting the holding members holding the flattened seal section of the baseless incandescent lamp therebetween into a lamp holding chamber of a main socket body, thereby fixing the holding members to said main socket body.