Barcode Reader, Barcode Reading Method, and Barcode Reading Program

There is provided a barcode reader that decode of a barcode (103) is possible with easy processes even in a case where reflectivity around the barcode (103) is higher than reflectivity at bright portions of the barcode (103). The barcode reader comprises: an edge deleter configured to delete the position information and polarity information on an unnecessary edge which arises due to a difference between a strength of a reflected light from a quiet zone of the barcode (103) and a strength of a reflected light from an adjacent portion of the quiet zone, wherein, on detecting two successive edges which have the same polarity, the edge deleter determines an edge which is closer to an end portion of a scan as the unnecessary edge and deletes the position information and polarity information on the unnecessary edge.