A monitoring apparatus for monitoring open/close statuses of open/close portions (5) of multiple money processing machines (1) includes: a reader monitoring apparatus (3) which monitors open/close status of the open/close portion (5) of each of the multiple money processing machines (1) by using an RFID inlet (6) and an RFID reader (4); and a control apparatus (2) for monitoring a processing status of each of the multiple money processing machines (1). If the reader monitoring apparatus (3) detects that the open/close portion (5) of the money processing machine (1) is opened, and if the control apparatus (2) determines that the money processing machine (1) is not operating, an alarm signal is output.