Abstract: A semiconductor device includes a substrate having a key region, a dummy active pattern on the key region, the dummy active pattern including a first impurity region and a second impurity region, a line structure provided on the first impurity region and extended in a first direction, a dummy gate electrode provided between the first and second impurity regions and extended in a second direction crossing the first direction, and a dummy contact disposed adjacent to a side of the line structure and connected to the second impurity region. The dummy contact includes a plurality of long contacts arranged in the second direction.