A searching device includes: a storage section for storing target information; a display section for displaying target images; an instructing section for selecting a target-image among the displayed target images; and a narrowing-down controlling section for narrowing down the target information, and for displaying the target images corresponding to the narrowed-down target information, wherein the narrowing-down controlling section includes: a feature information calculating section for calculating feature information; a coordinate space setting section for setting a coordinate space based on the feature information; a target information coordinate identifying section for identifying a coordinate of target information; a narrowing-down section for narrowing down a scope of coordinate space; and a narrowed-down target information extracting section for extracting the target information within the scope, and the narrowing-down controlling section performs control to repeat the identifying, the narrowing down, and the extracting, at each time of selecting the target image.