In a method of forming an asymmetric recess, an asymmetric recessed gate structure filling the asymmetric recess, a method of forming the asymmetric recessed gate structure, a semiconductor device having the asymmetric recessed gate structure and a method of manufacturing the semiconductor device, a semiconductor substrate is etched to form a first sub-recess having a first central axis. A second sub-recess is formed under the first sub-recess. The second sub-recess is in communication with the first sub-recess. The second sub-recess has a second central axis substantially parallel with the first central axis. The second central axis is spaced apart from the first central axis.