A method of producing a wiring board on which a semiconductor chip is to be mounted, includes: adhering an aluminum foil to one surface of a resin substrate; providing a heat-hardening resin layer having a predetermined shape on the aluminum foil; removing a part of the aluminum foil which is exposed from the heat-hardening resin layer to form a wiring circuit; and providing a thermoplastic resin layer on the wiring circuit. The heat-hardening resin layer has strength that enables the wiring board to prevent short between the semiconductor chip and the wiring circuit and has a crosslinking degree that is so reduced as to enable the bump to remove the heat-hardening resin layer to reach the wiring circuit, when the heat is applied to the wiring board and the bump to which the ultrasonic wave is applied is pressed to the wiring board.
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