Abstract: A cervical orthosis has front and rear cervical orthosis members. The front cervical orthosis member includes a chest support abutting against the region from the shoulders to the chest. Two front supporting portions are arranged from the chest support along both side portions of the anterior of neck and both side portions of the head. The rear cervical orthosis member includes a back support abutting against the region from the shoulders to the back. Two rear supporting portions are arranged from the back support along both side portions of the posterior of neck. An occipital region brace portion extends further upward from the upper end of each of the rear supporting portions so as to brace the occipital region. The cervical orthosis also has a forehead brace member abutting against the forehead and bracing the frontal region, and a cheek brace member arranged on the internal surfaces of the front supporting portions so as to brace the cheeks without disturbing the movement of the mandible.