The paper holder includes: a case having a front portion, a back portion, an upper portion, and an insertion opening for inserting the paper; and a holding piece having a blade in such a manner as to project from an end thereof on the front portion side, the holding piece being axially supported rotatably, and biased by spring force in the paper pulling direction. The back portion includes an extended back portion formed extending further downward than a lower end portion of the front portion, and an inclined portion extending substantially linearly from a lower end portion of the extended back portion in the paper insertion direction, when viewed from the side, and the front portion has transparency.