A component mounting machine including a camera configured to capture an image of a component held by a suction nozzle; and an image processing section configured to process the image captured by the camera, recognize the shape of the component, and measure shape data of the component; wherein, when the deviation amount of the measurement value of the shape data of the component exceeds the allowable value, the deviation amount of the measurement value of the shape data of the component is compared to a retry determination that is larger than the allowance value, and if the deviation amount of the measurement value of the shape data of the component exceeds the retry determination value, the component is determined to be abnormal and is discarded to a specified discard location.