A semiconductor device is provided with connection reliability between a bump electrode and a substrate electrode. An elastic modulus of an adhesive material used to electrically connect a metal bump and an interconnect pattern, and sealing the circuit surface of an LSI chip, after thermosetting is Ea; an elastic modulus of an insulating material of a packaging substrate surface layer after thermosetting is Eb; an elastic modulus of a core material, if used, is Ec, and the following rational expression is satisfied at normal temperature or a thermal contact bonding temperature of the adhesive material: at least Ea

 
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