A system of a mounting head maintenance device and a mounting head, the mounting head comprising: a nozzle holding section that is configured to detachably hold a suction nozzle, and an internal flow path that is configured to selectively supply negative pressure air and positive pressure air to the held suction nozzle, and the mounting head maintenance device comprising: an external flow path (80, 81, 82, 83) configured to communicate with the internal flow path of the mounting head, a reference air sensor (8X, 8Y) provided in the external flow path (80, 81, 82, 83) and configured to detect at least one of the flow rate and the pressure of the air; and a detection result acquiring section configured to acquire a reference detection result of the reference air sensor (8X, 8Y), characterized in that the mounting head further comprises an internal air sensor (4X, 4Y) that is provided in the internal flow path and is configured to detect at least one of the flow rate and the pressure of the air; the detection result acquiring section is further configured to acquire an internal detection result of the internal air sensor (4X, 4Y), and the mounting head maintenance device further comprises a comparing and determining section configured to compare the internal detection result with the reference detection result to determine at least one of accuracy and availability of the internal air sensor (4X, 4Y). a nozzle holding section that is configured to detachably hold a suction nozzle, and an internal flow path that is configured to selectively supply negative pressure air and positive pressure air to the held suction nozzle, and the mounting head maintenance device comprising: an external flow path (80, 81, 82, 83) configured to communicate with the internal flow path of the mounting head, a reference air sensor (8X, 8Y) provided in the external flow path (80, 81, 82, 83) and configured to detect at least one of the flow rate and the pressure of the air; and a detection result acquiring section configured to acquire a reference detection result of the reference air sensor (8X, 8Y), characterized in that the mounting head further comprises an internal air sensor (4X, 4Y) that is provided in the internal flow path and is configured to detect at least one of the flow rate and the pressure of the air; the detection result acquiring section is further configured to acquire an internal detection result of the internal air sensor (4X, 4Y), and the mounting head maintenance device further comprises a comparing and determining section configured to compare the internal detection result with the reference detection result to determine at least one of accuracy and availability of the internal air sensor (4X, 4Y). an external flow path (80, 81, 82, 83) configured to communicate with the internal flow path of the mounting head, a reference air sensor (8X, 8Y) provided in the external flow path (80, 81, 82, 83) and configured to detect at least one of the flow rate and the pressure of the air; and a detection result acquiring section configured to acquire a reference detection result of the reference air sensor (8X, 8Y), characterized in that the mounting head further comprises an internal air sensor (4X, 4Y) that is provided in the internal flow path and is configured to detect at least one of the flow rate and the pressure of the air; the detection result acquiring section is further configured to acquire an internal detection result of the internal air sensor (4X, 4Y), and the mounting head maintenance device further comprises a comparing and determining section configured to compare the internal detection result with the reference detection result to determine at least one of accuracy and availability of the internal air sensor (4X, 4Y).