A brace including a first member, a second member, a joint mechanism configured to support the first and second members, and an insertion-fitting member configured to be insertion-fitted into the joint mechanism, the joint mechanism includes an insertion-fitting receiving part configured to enable the insertion-fitting member to be insertion-fitted into the joint mechanism, and a regulation part disposed around the rotation axis in the second member, and the regulation part, which rotates around the rotation axis in an integrated manner with a rotation of the second member, makes surface contact with a projecting part of the insertion-fitting member fixed to the insertion-fitting receiving part on a trajectory of the rotation of the regulation part, so that a range of the rotation of the second member is regulated, the projecting part extending in a circumferential direction of the rotation of the second member.
