To provide the image collating device which can speedily perform collation with noise resistance while efficiently absorbing nonrigid deformation of an input image.

After a fingerprint image input part 11 inputs an input image of a fingerprint and a geometric distortion correction part 12 corrects geometric distortion, a positioning part 13 positions this input image with a reference image stored previously in a reference image storage part 16. Then a collation part 14 calculates the reference position of a block of interest according to the distance from the image center of the input image to the block of interest, finds the value correlative to the input image while deforming an Influence block, and corrects a reference position by using the displacement quantity of the influence block having the maximum correlative value.