A multi-joint nut configured such that a first nut part having a center portion provided with a first fastening part and a second nut part having a center portion provided with a second fastening part are coupled to each other, the multi-joint nut being easily manufactured and being configured such that the first nut part or the second nut part that matches a diameter of a coupling part of a fastening object is capable of being selectively coupled. Furthermore, the multi-joint nut may include the first nut part which is provided with the first fastening part and which has a mounting part that forms a space part, and may include a second nut part which is formed in a ring shape and provided with the second fastening part.