Method of manufacturing printed wiring board with built-in electronic component

A method of manufacturing a printed wiring board, comprising:

• providing a base substrate comprising a first insulation layer, a second insulation layer, and a conductive film, wherein the conductive film is provided on a first surface of the first insulation layer, the second insulation layer is provided on a second surface opposite to the first surface of the first insulation layer, and the second insulation layer has an opening for enclosing an electronic component;
• forming an alignment mark by removing at least a portion of the conductive film;
• providing an adhesive layer on the second surface of the first insulation layer at a position being exposed through the opening of the second insulation layer and determined based on the alignment mark;
• placing the electronic component on the adhesive layer at a position determined based on the alignment mark;
• forming a third insulation layer on the second insulation layer to enclose the electronic component inside the opening of the second insulation layer;
• forming a via hole to penetrate the conductive film and the first insulation layer, the via hole being formed at a position determined based on the alignment mark, and the via hole exposing a terminal of the electronic component;
• plating a surface of the conductive film and a surface of the via hole to form a via conductor in the via hole and to form a conductive layer on the conductive film, the via conductor being connected to the terminal of the electronic component;
• and
• patterning the conductive layer to form a conductive circuit connected to the via conductor.