To provide a joint support unit, etc. capable of being worn on both left and right joints. A joint support unit 20 includes a first link 21 worn on one end side of a knee joint, a second link 22 worn on the other end side of the knee joint, and a driving unit 30 configured to cause the first link 21 and the second link 22 to perform rotational movement, or to relatively perform rotational movement while moving a rotation center and to perform sliding movement.