A cervical collar is provided, including: a collar member; a chin support, movably disposed on the collar member; a connection member, movably disposed on the collar member, connected with the chin support; and an adjustment assembly, including an inner thread portion, a thread shaft and a knob, the inner thread portion being disposed on the connection member, the thread shaft being disposed on the collar member and rotatable about an axial direction, the inner thread portion and the thread shaft being screwed with each other, the knob being connected with the thread shaft on the axial direction and located outside an end of the collar member in the axial direction, wherein the thread shaft rotates to drive the inner thread portion to move in the axial direction.