A banknote processing machine comprising: a housing; an insertion unit configured to put a banknote into the housing of the banknote processing machine; a transport unit connected to the insertion unit and configured to transport the banknote inside the housing of the banknote processing machine; a recognition unit provided at the transport unit and configured to recognize the banknote put into the housing of the banknote processing machine by the insertion unit; a plurality of storing/feeding units each of which is connected to the transport unit and configured to store the banknote therein and to feed out the stored banknote; a first cassette connected to the transport unit and configured to store the banknote therein and to feed out the stored banknote, the first cassette being in the housing; and a controller configured to control the transport unit and the storing/feeding units, wherein the banknote processing machine further comprises a storage unit configured to store information on the banknote stored in the first cassette, the information being an order and a denomination of the banknote; and a cassette accommodation unit configured to detachably accommodate the first cassette, wherein the controller is configured to selectively perform a leaving mode, in which the banknotes are fed out from each of the storing/feeding units, transported to the first cassette by the transport unit, and stored and left in the first cassette when the first cassette is accommodated in the cassette accommodation unit, or a replenish mode, in which, based on the information stored in the storage unit, the banknotes are fed out from the first cassette accommodated in the cassette accommodation unit, transported to each of the storing/feeding units by the transport unit, and stored in the storing/feeding unit, characterised in that the banknote processing machine further comprises an ink spray unit configured to spray ink toward the banknote stored in the first cassette, wherein the controller is configured to switch on and off an operation of the ink spray unit, the controller is configured to control the ink spray unit such that the operation of the ink spray unit is switched on when the leaving mode is performed, the controller is configured to control the ink spray unit such that the operation of the ink spray unit is switched off when the replenish mode is performed, the ink spray unit is provided on the first cassette, and the ink spray unit is configured to spray ink toward the banknote stored in the first cassette, when a person who is not authorized to remove the banknote from the first cassette removes the banknote from the first cassette, or when a person who is not authorized to remove the first cassette from the cassette accommodation unit removes the first cassette from the cassette accommodation unit. a housing; an insertion unit configured to put a banknote into the housing of the banknote processing machine; a transport unit connected to the insertion unit and configured to transport the banknote inside the housing of the banknote processing machine; a recognition unit provided at the transport unit and configured to recognize the banknote put into the housing of the banknote processing machine by the insertion unit; a plurality of storing/feeding units each of which is connected to the transport unit and configured to store the banknote therein and to feed out the stored banknote; a first cassette connected to the transport unit and configured to store the banknote therein and to feed out the stored banknote, the first cassette being in the housing; and a controller configured to control the transport unit and the storing/feeding units, wherein the banknote processing machine further comprises a storage unit configured to store information on the banknote stored in the first cassette, the information being an order and a denomination of the banknote; and a cassette accommodation unit configured to detachably accommodate the first cassette, wherein the controller is configured to selectively perform a leaving mode, in which the banknotes are fed out from each of the storing/feeding units, transported to the first cassette by the transport unit, and stored and left in the first cassette when the first cassette is accommodated in the cassette accommodation unit, or a replenish mode, in which, based on the information stored in the storage unit, the banknotes are fed out from the first cassette accommodated in the cassette accommodation unit, transported to each of the storing/feeding units by the transport unit, and stored in the storing/feeding unit, characterised in that the banknote processing machine further comprises an ink spray unit configured to spray ink toward the banknote stored in the first cassette, wherein the controller is configured to switch on and off an operation of the ink spray unit, the controller is configured to control the ink spray unit such that the operation of the ink spray unit is switched on when the leaving mode is performed, the controller is configured to control the ink spray unit such that the operation of the ink spray unit is switched off when the replenish mode is performed, the ink spray unit is provided on the first cassette, and the ink spray unit is configured to spray ink toward the banknote stored in the first cassette, when a person who is not authorized to remove the banknote from the first cassette removes the banknote from the first cassette, or when a person who is not authorized to remove the first cassette from the cassette accommodation unit removes the first cassette from the cassette accommodation unit.