A medium handling method that is performed by a medium handling device (1, 100) when an error occurs during a medium deposit process of storing media from an inlet unit (21, 101) into a storage unit (104, 310, 320, 330, 341, 342, 350) via a temporary storage unit (23, 103), the medium handling method comprising: recognizing the media sequentially taken into the medium handling device (1, 100) via the inlet unit (21, 101) by a recognition unit (24, 102); storing the recognized media in the temporary storage unit (23, 103); storing a number of media stored in the temporary storage unit (23, 103) by a memory; confirming the number of media stored in the temporary storage unit (23, 103) as a number of media deposited based on an operation of an operator by a control unit (51, 106); after confirming the number of media stored in the temporary storage unit, storing the media fed out of the temporary storage unit (23, 103) in the storage unit (104, 310, 320, 330, 341, 342, 350), and storing the number of media stored in the storage unit (104, 310, 320, 330, 341, 342, 350) by the memory; wherein the control unit (51, 106) performs a reconciliation process in a case where the error occurs during the medium deposit process while a transport unit (4, 105) is transporting the media to the temporary storage unit (23, 103) or the storage unit (104, 310, 320, 330, 341, 342, 350) and the number of media stored in the memory becomes uncertain, the reconciliation process being a process in which the control unit (51,106) checks the number of media stored in the temporary storage unit (23, 103) or the storage unit (104, 310, 320, 330, 341, 342, 350) using the temporary storage unit (23, 103) while at least a part of the media stored in the temporary storage unit from the inlet during the medium deposit process where the error occurs remain in the temporary storage unit (23, 103). recognizing the media sequentially taken into the medium handling device (1, 100) via the inlet unit (21, 101) by a recognition unit (24, 102); storing the recognized media in the temporary storage unit (23, 103); storing a number of media stored in the temporary storage unit (23, 103) by a memory; confirming the number of media stored in the temporary storage unit (23, 103) as a number of media deposited based on an operation of an operator by a control unit (51, 106); after confirming the number of media stored in the temporary storage unit, storing the media fed out of the temporary storage unit (23, 103) in the storage unit (104, 310, 320, 330, 341, 342, 350), and storing the number of media stored in the storage unit (104, 310, 320, 330, 341, 342, 350) by the memory; wherein the control unit (51, 106) performs a reconciliation process in a case where the error occurs during the medium deposit process while a transport unit (4, 105) is transporting the media to the temporary storage unit (23, 103) or the storage unit (104, 310, 320, 330, 341, 342, 350) and the number of media stored in the memory becomes uncertain, the reconciliation process being a process in which the control unit (51,106) checks the number of media stored in the temporary storage unit (23, 103) or the storage unit (104, 310, 320, 330, 341, 342, 350) using the temporary storage unit (23, 103) while at least a part of the media stored in the temporary storage unit from the inlet during the medium deposit process where the error occurs remain in the temporary storage unit (23, 103).