Abstract: A sheet storage case for storing therein a stack of sheets. The sheet storage case is assembled into a sheet feeding device which feeds out an uppermost sheet of the stack of sheets. The sheet storage case includes a bottom plate, a first positioning member fixedly secured to the bottom plate and a slidably movable second positioning member provided in the bottom plate. The second positioning member has a sheet receiving portion for receiving the stack of sheets. The second positioning member is movable toward and away from the first positioning member. To mount a stack of sheet on the sheet storage case, the second positioning member is moved away from the first positioning member, the sheets are placed on the sheet receiving portion, and then the second positioning member is moved toward the first positioning member. The side edges of the sheets are aligned, because the sheets are fittedly interposed between the two positioning members.