An apparatus to control an inclination of an organic light emitting display panel, the apparatus including: a rotation pin having a body formed to be angulated; a support including an arm coupled to the rotation pin to support the rotation pin, the arm including a connection hole to support the rotation pin and a stopper provided to protrude under the connection hole; and a rotation part into which the rotation pin is settled in, the rotation part including an adhesion groove corresponding to the stopper and a hooking groove formed on the adhesion groove to control a rotation of the rotation part around the rotation pin, wherein the rotation of the rotation part is limited by a contact between the hooking groove and the stopper.