A gene sequence-reading instrument comprising attractive force-generating probes (terminals) each retaining DNA-constituting bases to carbon nanotubes, a detecting part for detecting the attractive force generated between the base sequences on RNA having gene information and said attractive force-generating probes as distortion, an amplifying part for amplifying said distortion, a recording part for recording the distortion signal from said amplifying part, and a display part for displaying base sequences of RNA based on the information recorded in said recording part.