Patent ID: 8742601

Claim:
A semiconductor device comprising: a semiconductor chip; a wiring that is included in the semiconductor chip, the wiring having a first part and a second part, a first width of the first part being different from a second width of the second part, the wiring having a coupling part between the first part and the second part; a pad that is formed above the wiring and in a position overlapping the coupling part; a bump that is formed on the pad; a buffer layer that is formed in a position between the coupling part and the pad so as to cover the entire coupling part; a diffusion layer that is formed in a position below the second part; a first contact part that is formed in a position between the second part and the diffusion layer; and inorganic insulating layers that are formed between the wiring and the buffer layer and between the buffer layer and the pad, respectively, wherein the buffer layer is made of a material other than resin and softer than the inorganic insulating layer.