1. A streaked pattern image matching method for matching a first streaked pattern image and a second streaked pattern image, said method comprising steps of: extracting skeleton pixel data that indicate skeletons, said skeletons being lines obtained by thinning each streak of a streaked pattern image; establishing a correspondence between skeleton pixels by specifying pixels among the skeleton pixels of said second streaked pattern image that correspond to skeleton pixels of said first streaked pattern image; and rating a degree of matching between said first streaked pattern image and said second streaked pattern image based on skeleton pixels of said first streaked pattern image that has undergone the process of establishing correspondence.