Abstract: A paper money input and output device includes a money input unit to which paper money is paid in, a money output unit which releases paper money to the exterior of the device, a plurality of recirculation cases which, along with storing paper money, also output stored paper money to the money output unit, a collection case which can store paper money from the money input unit or the plurality of recirculation cases, and a rejected-for-payout case which stores money which has been paid out from the recirculation cases and which has been rejected for outpayment; and, along with these units being arranged so that the thickness direction of the paper money which they receive is in the same direction, and along with them being provided in a stacked state in that direction, on one side only of a direction which is orthogonal with respect to the direction along which the money input unit, the money output unit, the collection case, the rejected-for-payout case, and the recirculation cases are provided in a stacked