A wireless field device (1a, 1b) comprising: a first communication unit that is configured to perform wireless communication via a wireless network; a second communication unit that is configured to perform communication with a provisioning device; a storage unit that stores setting information including at least one of device information specifying the wireless field device (1a, 1b), communication setting information for implementing wireless communication via the wireless network, and device setting information prescribing an operation of the wireless field device (1a, 1b); a determination unit that is configured to determine whether or not the wireless communication can be performed via the wireless network; and a change control unit that is configured to perform lock control not to enable a change of the setting information if the determination unit determines that the wireless communication via the wireless network is possible and prohibition information representing prohibition of the change of the setting information and transmitted from a device management apparatus is received by the first communication unit, wherein if cancellation information cancelling the prohibition of the change of the setting information and transmitted from the device management apparatus is received by the first communication unit, then the change control unit performs control to change the setting information based on change information received by the second communication unit or change information received by the first communication unit, if the determination unit determines that the wireless communication via the wireless network is not possible, the change control unit does not perform the lock control, and the wireless field device (1a, 1b) further comprises a notification unit that transmits an alarm representing improper manipulation to the wireless network via the first communication unit if the change information is received by the second communication unit while the change control unit performs control of not enabling a change of the setting information. a first communication unit that is configured to perform wireless communication via a wireless network; a second communication unit that is configured to perform communication with a provisioning device; a storage unit that stores setting information including at least one of device information specifying the wireless field device (1a, 1b), communication setting information for implementing wireless communication via the wireless network, and device setting information prescribing an operation of the wireless field device (1a, 1b); a determination unit that is configured to determine whether or not the wireless communication can be performed via the wireless network; and a change control unit that is configured to perform lock control not to enable a change of the setting information if the determination unit determines that the wireless communication via the wireless network is possible and prohibition information representing prohibition of the change of the setting information and transmitted from a device management apparatus is received by the first communication unit, wherein if cancellation information cancelling the prohibition of the change of the setting information and transmitted from the device management apparatus is received by the first communication unit, then the change control unit performs control to change the setting information based on change information received by the second communication unit or change information received by the first communication unit, if the determination unit determines that the wireless communication via the wireless network is not possible, the change control unit does not perform the lock control, and the wireless field device (1a, 1b) further comprises a notification unit that transmits an alarm representing improper manipulation to the wireless network via the first communication unit if the change information is received by the second communication unit while the change control unit performs control of not enabling a change of the setting information.