A traction device includes an engaging assembly engaging with a mouthpiece to be attached to a maxilla inside a mouth of a human body and a support assembly supporting the engaging assembly in contact with a face of the human body, wherein the engaging assembly pulls the mouthpiece in an anterior direction of the human body. The support assembly includes an upper contact body configured to be in contact with a forehead of the face and a lower contact body configured to be in contact with an area of the face below the forehead and above a mandible.
