Patent ID: 8087837

Claim:
A cassette unit comprising: a cassette case which covers a printing medium and has a feeding opening for passing the printing medium to a printing apparatus body when the printing medium is fed by a feeding roller of the printing apparatus body; a cassette hopper which receives the printing medium, wherein the cassette hopper is configured to come into contact with or separate from the feeding roller when the cassette hopper is mounted in the printing apparatus body, wherein the cassette hopper is joined with the cassette case at a first joint portion; and a shutter configured for switching so as to allow the printing medium to pass through the feeding opening or to prevent the printing medium from passing through the feeding opening, wherein the shutter joins the cassette case at a second joint portion and is configured for bending, at the second joint portion, toward an inside of the cassette case to engage with a second engagement portion provided in the cassette case, wherein the cassette case, the cassette hopper, and the shutter are integrally formed, wherein the cassette hopper is bent in a direction in which the cassette hopper approaches the feeding roller to engage with a first engagement portion provided in the cassette case.