In the illustrations, numeral 201 represents a component or part such as an IC chip and an LSI chip, numeral 202 designates an external electrode(s) located on a bottom surface of a component, numeral 203 denotes a substrate made of, for example, Al2 O3, numeral 204 depicts a conductor(s) such as a land situated on a top surface of the substrate 203, and numeral 205 signifies a bump made of Au, Cu