Patent ID: 7579652

Claim:
A semiconductor device comprising: an emitter region provided in a semiconductor substrate facing its principal plane, a body region provided below the emitter region, a drift region provided below the body region, a gate electrode of trench structure, insulated from each of the emitter region, the body region, and the drift region, a field region provided in the semiconductor substrate facing its principal plane, the field region being configured to divide the emitter region and the body region into cells, and a contact electrode provided outside of the semiconductor substrate connecting with the emitter region and the field region, wherein the emitter region, the body region, and the drift region constitute an insulated gate transistor divided by the field region, the field region is the same conductive type as a portion of the emitter region that contacts with the field region, the field region being low in impurity concentration, the field region contacts with the contact electrode at a corner portion of contacting portion of the semiconductor substrate to the contact electrode, and the emitter region contacts with the contact electrode at another portion than the contacting portion of the field region to the contact electrode within the contacting portion of the semiconductor substrate to the contact electrode.