Embodiments of the present disclosure provide a robot arm apparatus including a fastener for fastening a first electronic component to a second electronic component, and a movable part configured to move the fastener. The fastener includes an arm connected to the movable part, a head connected to the arm and configured to contact the first electronic component, and a lock configured to be in contact with the arm when the first electronic component is moved to a reference space, and to be spaced apart from the arm when the first electronic component is fastened to the second electronic component after the first electronic component is moved to the reference space.