1. A biometric information input device comprising: a biometric information collection unit reading a relatively-moving living body site to thereby successively collect a plurality of partial images of said living body site as biometric information; a movement direction detection unit detecting a movement direction of said living body site with respect to said biometric information collection unit based on said biometric information; and a coordinate conversion unit performing a coordinate conversion on said biometric information, to thereby provide coordinate converted biometric information; and a display displaying an image of biometric information of the living body site from the coordinate converted biometric information, wherein the coordinate conversion unit performs the coordinate conversion using said movement direction detected by said movement direction unit so that said movement direction becomes a vertical and downward direction with respect to the displayed image being upright, and so that the display thereby displays the image as upright.