The present invention relates to a headrest controlling apparatus, and more particularly, to a headrest controlling apparatus which includes a headrest cover, a bracket installed on a stay rod, and a locking member installed in the bracket to fix a position of a headrest, wherein the headrest cover includes a stay rod coupling part to which the stay rod is rotatably coupled, and thus the headrest controlling apparatus can minimize a distance from the stay rod to a front lower edge of the apparatus, can be easily assembled due to the modularized bracket and locking member, and can be easily operated due to increased precision of the locking member.