A semiconductor device may include: a plurality of first contacts arranged at a predetermined distance in a first direction and a second direction crossing the first direction; a plurality of second contacts alternately arranged between the first contacts and arranged at a predetermined distance in the first direction and the second direction; a plurality of dog bone-type conductive lines connected to the second contacts arranged in the second direction, respectively, among the plurality of second contacts, and having concave parts and convex parts; and a plurality of etching prevention patterns formed over the plurality of conductive lines so as to overlap the conductive lines, respectively.