An illumination device for image capturing configured to illuminate an imaging target, an image of which is to be captured by a camera, using many LEDs arranged around a light axis of the camera, the illumination device for image capturing comprising: four LED-mounted boards on which many LEDs are mounted; a current adjusting device configured to adjust a current flowing through the LEDs of the four LED-mounted boards, wherein the four LED-mounted boards are arranged in a four-sided shape centered around the light axis of the camera as viewed from the imaging target, and each of the LED-mounted boards is inclined at a specified angle so that the LEDs of the LED-mounted boards face the imaging target, and the current adjusting device is configured to divide an LED-mounted area of each of the LED-mounted boards into multiple illumination areas and to individually adjust the current flowing to the LEDs of each of the LED-mounted boards for each of the multiple illumination areas, and the illumination device further comprising an image processing device configured to process an image captured by the camera, and an illumination mode switching section configured to switch to and from a production illumination mode in which the camera captures an image of the imaging target with the imaging target illuminated with the current adjusted by the current adjusting device flowing to the LEDs of each of the illumination areas during production, and a current adjusting illumination mode in which the current flowing to the LEDs in each of the illumination areas is adjusted by the current adjusting device individually for each of the illumination areas while production is stopped, and the current adjusting device is configured to, in the current adjusting illumination mode, switch the order in which the illumination areas for which the LEDs of each of the LED-mounted boards are turned on one by one, use the camera to capture an image of a reference jig as an imaging target illuminated with one of the illumination areas, use the image processing device to process the image, and determine a brightness level of a reference jig portion of the image, then perform processing to adjust the current flowing to the LEDs on that illumination area such that the brightness level of the reference jig portion becomes a specified reference brightness level, so as to adjust current flowing to the LEDs of each of the illumination areas individually for each of the illumination areas such that the brightness level of the illumination light of each of the illumination areas with respect to the reference jig is even. four LED-mounted boards on which many LEDs are mounted; a current adjusting device configured to adjust a current flowing through the LEDs of the four LED-mounted boards, wherein the four LED-mounted boards are arranged in a four-sided shape centered around the light axis of the camera as viewed from the imaging target, and each of the LED-mounted boards is inclined at a specified angle so that the LEDs of the LED-mounted boards face the imaging target, and the current adjusting device is configured to divide an LED-mounted area of each of the LED-mounted boards into multiple illumination areas and to individually adjust the current flowing to the LEDs of each of the LED-mounted boards for each of the multiple illumination areas, and the illumination device further comprising an image processing device configured to process an image captured by the camera, and an illumination mode switching section configured to switch to and from a production illumination mode in which the camera captures an image of the imaging target with the imaging target illuminated with the current adjusted by the current adjusting device flowing to the LEDs of each of the illumination areas during production, and a current adjusting illumination mode in which the current flowing to the LEDs in each of the illumination areas is adjusted by the current adjusting device individually for each of the illumination areas while production is stopped, and the current adjusting device is configured to, in the current adjusting illumination mode, switch the order in which the illumination areas for which the LEDs of each of the LED-mounted boards are turned on one by one, use the camera to capture an image of a reference jig as an imaging target illuminated with one of the illumination areas, use the image processing device to process the image, and determine a brightness level of a reference jig portion of the image, then perform processing to adjust the current flowing to the LEDs on that illumination area such that the brightness level of the reference jig portion becomes a specified reference brightness level, so as to adjust current flowing to the LEDs of each of the illumination areas individually for each of the illumination areas such that the brightness level of the illumination light of each of the illumination areas with respect to the reference jig is even.