Patent ID: 7405138

Claim:
A manufacturing method of a semiconductor device comprising: forming a nearly concave groove of a specified depth in a boundary region of a circuit forming surface of semiconductor elements, in a semiconductor wafer having a region for plural semiconductor elements, forming an insulating layer in a specified region of a side surface of said nearly concave groove and on said circuit forming surface, forming a wiring in a specified region of said circuit forming surface, including an entire surface of an inside of the nearly concave groove, forming a bump electrode having a specified height on said wiring at the boundary region, including the inside of the nearly concave groove, sealing the circuit forming surface with a resin, the resin exposing a surface of said bump electrode, polishing a confronting surface of the semiconductor wafer opposite the circuit forming surface to expose the nearly concave groove at said confronting surface, sealing an entirety of the confronting surface of the semiconductor wafer with resin, including an end portion of the wiring formed at an exposed side surface of the nearly concave groove, forming a ball electrode on said bump electrode, cutting the semiconductor wafer along the exposed nearly concave groove, and forming plural semiconductor devices having side surfaces thereof exposing said ball electrode, the bump electrode and the wiring, and heating the cut semiconductor devices at a specified temperature, so that parts of the ball electrode formed on the bump electrode are on side surfaces of the semiconductor devices.