A sheet in accordance with the present invention includes sheets as print mediums for a printer and a package member surrounding the sheets which have been stacked up. The sheet package is configured so that the sheets can be set in the printer together with the package member exposing part of the sheets. The package member is integrally provided with a flap part which can expose part of the sheets by being opened when the sheet package is set in the printer and cover the exposed part of the sheets by being closed when the sheet package is not used.