Patent ID: 8482060

Claim:
A semiconductor device comprising: a drift region of a first conductivity type selectively provided in a drain layer of the first conductivity type from a surface of the drain layer to an inside of the drain layer; a base region of a second conductivity type selectively provided in the drift region from a surface of the drift region to an inside of the drift region; a source region of the first conductivity type selectively provided in the base region from a surface of the base region to an inside of the base region; a gate electrode in a trench shape penetrating from a part of the source region through the base region adjacent to the part of the source region to reach a part of the drift region in a direction substantially parallel to a major surface of the drain layer; a contact region of the second conductivity type selectively provided on the surface of the drift region, the contact region containing an impurity having a concentration higher than an impurity concentration of the base region; a drain electrode connected to the drain layer; and a source electrode connected to the source region and the contact region, wherein a portion of the source electrode is directly connected to said contact region, the contact region extending from a side of the drain layer toward the drift region and not contacting the drain layer.