Patent ID: 8535987

Claim:
A manufacturing method of a substrate for a semiconductor element, the manufacturing method comprising: a first process and a second process, the first process comprising forming a first photosensitive resin layer on a first surface of a metal plate; providing a second photosensitive resin layer on a second surface different from the first surface of the metal plate; forming a first resist pattern on the first surface of the metal plate, for forming a connection post, by selectively performing an exposure to the first photosensitive resin layer according to a first pattern, and by developing the first photosensitive resin layer, the first resist pattern comprising the first photosensitive resin layer which was developed; and forming a second resist pattern on the second surface of the metal plate, for forming a wiring pattern, by selectively performing an exposure to the second photosensitive resin layer according to a second pattern, and by developing the second photosensitive resin layer, the second resist pattern comprising the second photosensitive resin layer which was developed; and the second process comprising performing an etching of the first surface of the metal plate from the first surface to a midway of the metal plate, and forming the connection post on the first surface; filling in a premold liquid resin to the first surface which was etched; forming a premold resin layer by hardening the premold liquid resin; performing a grinding operation on the first surface, and exposing an upper bottom surface of the connection post from the premold resin layer; and performing an etching of the second surface of the metal plate from the second surface, and forming the wiring pattern, wherein a groove structure is formed at a peripheral of a pattern of a main body of the substrate by going through the first step and the second step, wherein a depth of the groove structure is up to an intermediate part in a thickness direction of the metal plate.