The present invention relates to a permanent rod. The permanent rod includes a tube-shaped rod body. In the rod body, a pair of cut surfaces is provided to form a band-shaped insertion opening over the entire longitudinal section of the rod body, and a plurality of compression grooves each having a concave bottom surface are formed in the outer surface of the rod body over the entire longitudinal section. Also, the permanent rod includes: a compression member body having a compression surface corresponding to each of the grooved bottom surfaces; and a compression member detachably coupled to the rod body so that the compression surface contacts the grooved bottom surface. Therefore, the permanent rod may create various wave styles.