Patent ID: 7595228

Claim:
A method for manufacturing an electronic component-mounted board, the method comprising: fabricating a wiring board comprising a core board and a buildup section, the core board comprising a laminated structure including a core layer and a spacer layer, the buildup section being formed on the spacer layer and comprising a laminated structure including a wiring pattern and an insulating layer, the build up section being provided with an electrode section held in contact with the spacer layer; removing a part of the core layer that corresponds to the electrode section by conducting etching of the core layer from a side opposite to the buildup section; conducting etching of the spacer layer from a side opposite to the buildup section to expose the electrode section and to form a protrusion as a remaining part of the spacer layer, the protrusion projecting from a surface of the buildup section at a portion of the buildup section other than the electrode section of the buildup section; and mounting an electronic component including a bump electrode on the wiring board by joining the bump electrode and the electrode section of the buildup section, with the protrusion contacting a portion of the electronic component other than the bump electrode.