Patent ID: 7015554

Claim:
A semiconductor device comprising: a semiconductor substrate including a first active region and a second active region; a first MIS transistor provided in the first active region and including a first gate electrode having a first gate width; and a second MIS transistor provided in the second active region and including a second gate electrode having a second gate width wider than the first gate width; wherein the first MIS transistor includes, in the first active region below the first gate electrode, a first threshold-voltage-adjusting impurity diffusion region including two first impurity diffusion regions, which extend from both end parts of the first active region that are located in the gate width direction of the first gate electrode, and come into contact with each other in the central part of the first active region; and the second MIS transistor includes, in the second active region below the second gate electrode, a second threshold-voltage-adjusting impurity diffusion region including two second impurity diffusion regions, which extend from both end parts of the second active region that are located in the gate width direction of the second gate electrode, and located apart from each other with the central part of the second active region interposed therebetween.