A retrieval device includes: a printer configured to print a document onto paper together with an identifier image, the identifier image representing an identifier of the document; a storage configured to correlate electronic data for the document with the identifier to store the electronic data; an image taking device configured to photograph the identifier image in the paper; an input device configured to receive an input of a keyword; a search portion configured to search for the keyword in the document by using the electronic data corresponding to the identifier represented in the identifier image photographed; and a display device configured to display a result of the search made by the search portion.