A nanogap device which may include a first insulation layer having a nanopore formed therein, a first channel layer which may be on the first insulation layer, a first source electrode and a first drain electrode which may be respectively in contact with both ends of the first channel layer, a second insulation layer which may cover the first channel layer, the first source electrode, and the first drain electrode, and a first nanogap electrode which may be on the second insulation layer and may be divided into two parts with a nanogap, which faces the nanopore, interposed between the two parts.