Semiconductor package, semiconductor device, electronic device and production method for semiconductor package

摘要

An insulating layer (3) is formed on a Si wafer (1). An opening portion is made in this insulating layer (3), and subsequently a rerouting layer (2) is formed. Next, a resin layer (4) is formed on the rerouting layer (2). The resin layer (4) is then cured so that the rerouting layer (2) and a Cu foil (5) are bonded to each other through the resin layer (4). Thereafter, a ring-like opening portion (4a) is made in the resin layer (4), and a Cu plating layer (8) is formed inside this opening portion (4a).