An electronic component orientation determination data creation device for creating component orientation determination data used in a component orientation determination system that determines an orientation of the component by comparing a brightness value of a determination region specified in the component orientation determination data within an image of the component captured by a camera with a determination threshold, the component orientation determination data creation device comprising: a difference image calculating means configured to calculate a difference image between an image of the component in a correct orientation and an image of the component in another orientation by acquiring multiple images of the component in different orientations by changing the orientation with respect to the camera of the component that is the target for the component orientation determination data creation; a component orientation determination data calculating means configured to obtain a region for which the brightness difference within the difference image is maximized or is equal to or greater than a specified value, and to calculate the component orientation determination data including position information that specifies the determination region inside the region for which the brightness difference within the difference image is maximized or is equal to or greater than a specified value; and an optimal imaging conditions search means configured to select optimal imaging conditions for which the brightness difference and/or the surface area of the determination region is maximized from all the imaging conditions obtained by repeating processing of the component orientation determination data calculating means obtaining the determination region based on the difference image calculated by the difference image calculating means using the multiple images of the component in different orientations under changed imaging conditions, and include information of the selected optimal imaging conditions in the component orientation determination data, wherein the component orientation determination data calculating means is configured to calculate the determination threshold based on the brightness value of the determination region of the image of the component in the correct orientation, and the brightness value of the determination region of the image of the component in a different orientation or the brightness difference of the determination region of the difference image, and to include the calculated determination threshold in the component orientation determination data. a difference image calculating means configured to calculate a difference image between an image of the component in a correct orientation and an image of the component in another orientation by acquiring multiple images of the component in different orientations by changing the orientation with respect to the camera of the component that is the target for the component orientation determination data creation; a component orientation determination data calculating means configured to obtain a region for which the brightness difference within the difference image is maximized or is equal to or greater than a specified value, and to calculate the component orientation determination data including position information that specifies the determination region inside the region for which the brightness difference within the difference image is maximized or is equal to or greater than a specified value; and an optimal imaging conditions search means configured to select optimal imaging conditions for which the brightness difference and/or the surface area of the determination region is maximized from all the imaging conditions obtained by repeating processing of the component orientation determination data calculating means obtaining the determination region based on the difference image calculated by the difference image calculating means using the multiple images of the component in different orientations under changed imaging conditions, and include information of the selected optimal imaging conditions in the component orientation determination data, wherein the component orientation determination data calculating means is configured to calculate the determination threshold based on the brightness value of the determination region of the image of the component in the correct orientation, and the brightness value of the determination region of the image of the component in a different orientation or the brightness difference of the determination region of the difference image, and to include the calculated determination threshold in the component orientation determination data.