Abstract: There can be realized a compact optical network unit with an optical cable provided between an optical cable housing and an optical video terminal housing. When the optical video terminal housing is opened and closed by rotating 90 degrees or more about hinges connecting the two housings, the extra length of the optical cable is absorbed in an optical cable length adjustment portion of the optical video terminal housing as well as in an optical cable housing portion. Thus, the optical cable can be smoothly moved through a cable guide which is a base point of the movable portion of the optical cable, without an operation to prevent the optical cable from being stuck.