Endoscope apparatus includes: a tube unit coupled to a rotary shaft to which a rotational force is transmitted so as to be rotatable, the tube unit being formed to extend in one direction； steering unit having one end installed at one end of the tube unit to rotate with respect to the tube unit so that a direction thereof facing forward is adjusted, the steering unit rotating together with the tube unit by the rotational force transmitted from the tube unit； an end effector installed inside the steering unit to rotate together with the steering unit due to the rotation of the steering unit, the end effector being disposed to face forward； and shaft-fixing tube body installed at the end effector, wherein the direction of the steering unit facing forward and relative rotation of the steering unit with respect to the end effector are adjustable.
