Cervical vertebrae orthosis

A cervical vertebrae orthosis comprising:

• a thoracic cage body (1) being freely attachable to a chest region of a human body in an outward fitting manner;
• and
• a lower jaw holding body (6) and an occipital region holding body (8) respectively mounted to front and rear of an upper portion in the thoracic cage body (1) via a pair of connection arms (51) and 52 with angle adjusting means (53) in both sides,
• wherein the angle adjusting means (53) is structured by coaxially pivoting a clutch member (54) with a radial pawl (56) fixed and attached to each of the thoracic cage body (1), the lower jaw holding body (6) and the occipital region holding body (8), a clutch portion (60) with the same shaped pawl (62) formed in the connection arms (51) and (52) so as to be engaged with the clutch member (54), a stopper ring (63) with an operation pawl (66) attached to the connection arms (51) and (52) so as to engage the clutch member (54) with the clutch portion (60) and fix them, and a holding member (76) with an operation pawl (80) provided so as to engage with and press to operate the operation pawl (66) of the stopper ring (63).