PROBLEM TO BE SOLVED: To improve detection accuracy in character string detection processing applied to an image.SOLUTION: A character string detection device in the invention detects a character string consisting of one or more characters from an image, and comprises: clustering means for defining at least one cluster, which consists of a certain number of pixel groups or more having similar colors, based on color information of each pixel constituting the image; clipping means for dividing the image into an area of a pixel group belonging to the cluster defined by the clustering means and an area of other pixel groups, and for generating a clipped image after eliminating the area of other pixel groups from the image; character string detection means for detecting each character in a targeted character string, which is a character string to be detected, from the clipped image generated by the clipping means, and for detecting the targeted character string.
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