A machine apparatus that a user can more easily operate includes a machine driver that is mechanically driven, a main operation unit that operates the machine driver, a remote operation unit that transmits an operation instruction signal to the machine driver at a position apart from the main operation unit, a position determiner that determines a position of the remote operation unit, and a controller that, upon determining that the remote operation unit is located in a predetermined area, enables operations by the main operation unit, and upon determining that the remote operation unit is located outside the predetermined area, disables at least some operations by the main operation unit.