A semiconductor device according to the present invention includes a semiconductor substrate, a pad formed on the semiconductor substrate, a rewiring that is electrically connected to the pad and led to a region outside the pad, a resin layer formed on the rewiring, and an external terminal electrically connected to the rewiring via the resin layer, and the resin layer is formed so as to enter the inside of a slit formed in a region along the periphery of the external terminal in the rewiring.