A semiconductor device, includes a package substrate having a first surface and a second surface opposite to the first surface, and a semiconductor element installed in the first surface of the package substrate. The package substrate includes a plurality of first land pads disposed in the first surface, second land pads disposed in the second surface and a second testing-dedicated pad disposed in the second surface. The semiconductor element is electrically coupled to the first land pads, an inter-pad distance for the second land pads is larger than an inter-pad distance for the first land pads, the first land pad contains a first testing-dedicated pad electrically coupled to the semiconductor element, the first testing-dedicated pad and the second testing-dedicated pad each include a dedicated terminal, which is essential for applying a specified electrical signal from an LSI tester, when an LSI testing is conducted for a semiconductor wafer and the first testing-dedicated pad is electrically coupled to only the second testing-dedicated pad through a wiring.