1. An image formation device comprising: an image formation section that forms an image to be outputted and a pattern image on an image-bearing body, the pattern image being formed at a non-image creation region outside an image creation region at which the outputted image is formed; a pattern image detection section that detects a position of the pattern image for detecting positional offset of the image; and a registration correction section that corrects the positional offset based on the detected position of the pattern image by deforming image data of the image to be outputted.