An intraoral scanner is provided, including a case including an opening formed at one end thereof, a light source unit disposed at the other end of the case and emitting light toward the opening, a first optical system disposed in the opening and reflecting the light emitted from the light source unit toward a subject and reflecting light reflected from the subject toward the light source unit, a second optical system disposed between the light source unit and the first optical system and reflecting light reflected from the first optical system, and an image sensor unit that detects the light reflected from the second optical system.