A paper sheet storage device includes a supply reel that supplies a rolled tape; a winding drum around which a banknote is wound together with the tape supplied from the supply reel; a first detection unit that detects a supply amount of the tape supplied from the supply reel; and a second detection unit that detects the winding drum of which the outer diameter becomes equal to or larger than a predetermined outer diameter when the banknote is wound around the winding drum together with the tape.