preparing a wiring board including a base board having a first surface and a second surface, a wiring pattern having electrical connectors and formed on the first surface, a first resist layer having a first opening for exposing the electrical connectors and covering at least a part of the first surface and a part of the wiring pattern, and a second resist layer having a second opening that overlaps with a region where the electrical connectors are formed and covering at least a part of the second surface;

preparing a semiconductor chip having electrodes; and

performing a bonding operation for electrically coupling the electrical connectors and the electrodes correspondingly by holding and heating the semiconductor chip with a bonding tool that has a heating mechanism and an end face whose contour is smaller than that of the second opening, aligning the bonding tool in such a way that the end face only overlaps with a region inside the second opening on the second surface, and mounting the semiconductor chip on the wiring board with the semiconductor chip facing the first surface.