A control apparatus with a setting data change function for controlling operation of a control-target object comprises: a main control section that makes an operation command to the control-target object; an input section that receives an input of trial setting data for checking the operation of the control-target object; a setting data storage section including a first storage section that stores the trial setting data and a second storage section that stores the setting data; and a setting data management section that manages an input and a record into the setting data storage section, wherein the setting data management section includes: a mode switch section that switches operation modes; a memory synchronization section that establishes synchronization between the first storage section and the second storage section; and a memory discard section that discards the trial setting data.