To provide a distortion correction method for performing image correction for small distortion by highly accurately acquiring distortion correction information of an image of a wide angle imaging apparatus.

In an imaging step S31, an imaging means having a wide angle lens photographs an inner surface of a cone several times. In a distortion information acquiring step S32, a position relationship showing a relationship between a pixel and a position of the inside of the cone corresponding to the pixel is acquired about each of images photographed in the imaging step S31. In a distortion correction information acquiring step S33, an angle of light reaching the pixel with respect to the principal axis of the wide angle lens and height of an intersection between the light reaching the pixel and the principal axis of the wide angle lens with respect to the origin of the imaging means are calculated on the basis of the position information obtained about each of the images.