A management method for a device such as a parts cassette (P), which is mounted on or attached to a given apparatus such as a component-mounting machine and is to be removed for maintenance such as keeping, inspection, and repair, is provided. The management method includes: storing maintenance data for each parts cassette (P) in a data management unit (8) and its database (7) to be recordable and readable; giving an identification code (4) such as a barcode to each parts cassette (P); reading a barcode (4) of a parts cassette (P) and inputting and outputting the read barcode (4) together with information required for maintenance by means of a mobile terminal (11); sending and receiving the maintenance data between the mobile terminal (11) and the data management unit (8) via a PHS radio relay device (10). Since the management method enables maintenance of the parts cassette (P) or the like to be performed by means of the mobile terminal (11), it is possible to easily manage the location and history of the device requiring maintenance, such as the parts cassette (P).