An integrated circuit device includes a substrate from which a plurality of fin-type active regions protrude, the plurality of fin-type active regions extending in parallel to one another in a first direction, and a plurality of gate structures and a plurality of fin-isolation insulating portions extending on the substrate in a second direction crossing the first direction and at a constant pitch in the first direction, wherein a pair of fin-isolation insulating portions from among the plurality of fin-isolation insulating portions are between a pair of gate structures from among the plurality of gate structures, and the plurality of fin-type active regions include a plurality of first fin-type regions and a plurality of second fin-type regions.