BIOLOGICAL INFORMATION ACQUIRING DEVICE, BIOLOGICAL INFORMATION ACCRUING METHOD, BIOLOGICAL INFORMATION ACQUIRING PROGRAM, AND BIOMETRIC AUTHENTICATION DEVICE

In order to make a precise determination on a collection status of a biometric information image, the present invention is configured to include a width detection device (12-1) that detects a width of a biometric part in a biometric information image collected by a collection device (11) that collects the biometric information image of the biometric part; a narrowing position detection device (13-1) that detects a narrowing position of the biometric part in the biometric information image on the basis of the width; an orientation information obtainment device (14) that obtains orientation information related to the biometric part in the biometric information image; and a determination device (15-1) that determines a collection status of the biometric information image on the basis of the orientation information near the narrowing position.