A joint apparatus for a robot includes a housing, a bearing including an inner ring and an outer ring contacting the housing, a rotating member contacting the inner ring of the bearing, and a driving apparatus configured to rotate the rotating member, where the first housing includes a first support region configured to support a front surface of the outer ring and a first fastening region extending rearward from the first support region and on which a first thread is formed, the sounding housing includes a second support region configured to support a rear surface of the outer ring and a second fastening region extending forward from the second support region and on which a second thread is formed, and the second thread is configured to engage the first thread.