To provide a feature point input assisting device that can carry out the input assistance of the feature point.A feature point input assisting device includes a processor circuitry. The processor circuitry configured to set a first feature point in an input image including a stripe pattern formed by ridge lines. The processor circuitry configured to extract a second feature point from the input image by using the first feature point. The processor circuitry configured to extract a feature point, which is the second feature point having no corresponding first feature point, as an input omission feature point candidate. The processor circuitry configured to output the input omission feature point candidate to a display device.