A semiconductor apparatus includes a semiconductor device having a semiconductor circuit formed on a first main surface, and including a via having an opening at a second main surface, a first wiring disposed on the first main surface of the semiconductor device, partially exposed at a bottom surface of the via, and connected to the semiconductor circuit, a first insulating layer covering the first wiring, and a redistribution wiring extending from a contact portion in contact with the first wiring at the bottom surface of the via, through an inside of the via and onto the second main surface, where a first through hole is formed in the first wiring, and the contact portion is in contact with a plurality of surfaces of the first wiring.