To realize highly precise pattern matching which can perform high-speed processing.

Processing speed improvement and highly precise detection are attained by establishing; a processing section 4 which creates a template image with projection addition data by obtaining the projection addition data of the template image; a processing section 6 which performs pattern matching by a normalization correlation detection means using the template image by the projection addition data to an object image, and extracts an area similar to the template image by the projection addition data as a candidate of partial image; and a processing section 7 which performs pattern matching by the normalization correlation detection means using the template image by pixel density data to the extracted area, and identifies the area whose matching degree with the template image by pixel density data is the highest, and by utilizing each of the features of normalization correlation detection mean using projection addition data, and the normalized correlation method using pixel density data.