A sheet cassette connectable to a printer includes a case, a spring, a cover, and a connecting part. The case stores a recording sheet. The spring is provided on the case. The cover covers the case and the spring and slides relative to the case to expose the spring. The connecting part is attached to the case and is connectable to the printer. The spring is exposed to press a recording sheet placed on the cover toward a position at which the printer is to be located when connected to the sheet cassette.