There is provided a motion assist device including a jth link worn on a jth portion of a user, an ith joint unit connected at one end of an ith link in a freely rotatable manner, a (j+1)th link worn on a (j+1)th portion of the user, an (i+1)th joint unit integral with one end of the (j+1)th link and coupled to the other end of the jth link, a single actuator installed at one of the jth link and a link adjacent to the jth and a transmission part transmitting a driving force of the actuator to the ith joint unit and the (i+1)th joint unit.
