A hair holder includes an arcuate main body having two engaging ends each having a slot defined by two lateral sides. A connecting rod is extended between the lateral sides. Two side members are releasably connected to the engaging ends of the main body, respectively. Each side member includes a first end having an engaging stub projected therefrom and a second end. The engaging stub includes a root end connected to the side member and a distal end. The root end includes a recessed section with a retaining edge. The distal end includes an engaging notch defined therein and an abutting section. Each engaging stub is releasably and pivotally engaged with an associated engaging end. The engaging notch receives the connecting rod and allows pivotal movement of the engaging stub between an extended position and a folded position relative to the connecting rod.