Baseplate structure in order the 1st baseplate and the surface which possess rigidity, to oppose to the surface of the 1st baseplate, to be provided with the surface of the 1st baseplate which opposes with the 2nd baseplate which possesses the rigidity which is arranged, and the surface of the 2nd baseplate the baseplate interval retention component which is kept in the value which decides the interval of the surface of two baseplates beforehand and, to be mounted by the 2nd baseplate, directing to the surface of the 1st baseplate from the surface of the 2nd baseplate and the mounted item which projects and, be provided in the 1st baseplate, the projection part of the mounted itemThe sealed component in order the perforation hole which is arranged and, it is provided on back side of the 1st baseplate, everything of opening of the perforation hole or covers part at least, to do the electric seal and, it possesses.基板構造は、剛性を有する第1の基板と、表面が、第1の基板の表面に対向するように配置される剛性を有する第2の基板と、対向する第1の基板の表面と第2の基板の表面との間に設けられ、二つ基板の表面同士の間隔を予め定めた値に保持する基板間隔保持部材と、第2の基板に実装され、第2の基板の表面から第1の基板の表面に向けて突出する実装品と、第1の基板に設けられ、実装品の突出部分が配置される貫通孔と、第1の基板の裏面側に設けられ、貫通孔の開口の全て又は少なくとも一部を覆う、電気的シールドをするためのシールド部材と、を具備する。
