Hinge mechanism, armrest and vehicle

The utility model provides a hinge mechanism, a handrail and a vehicle, the hinge mechanism comprises: a first support, the first support comprises a first support body and a rotating part connected with the first support body; the second support comprises a second support body and a matching part connected with the second support body, and the matching part and the rotating part are rotationally connected and matched to form a rotating assembly; at least one part of the guiding piece is located between the first support body and the second support body, a wire passing channel is formed in the guiding piece, and the wire passing channel is provided with a wire inlet and a wire outlet which are opened respectively; wherein the guide piece is located on the outer side of the rotating assembly. When the hinge mechanism provided by the embodiment of the utility model is applied to the automobile armrest, the guide piece is additionally arranged on the basis of an existing hinge rotating structure, so that the pro