PURPOSE: To provide the automatic testing device which can efficiently test the various functions of a rack constituting device.

CONSTITUTION: The automatic testing device for the rack constituting device mounted on a rack is provided with a first storage means 1 for storing the fixed data of a part to perform the set or control of the function part as test data provided for each kind of the function part and the parameter data of a part to specify the mounting position, second storage means 2 for storing an identification ID to specify test data (or the kind of the function part) as schedule data described corresponding to the mount state and address data to specify the mount position while relating them, and control part 3 for controlling the automatic test, and the control part 3 calls the correspondent test data from the first storage means 1 according to the identification ID in the second storage means 2 and executes the test while reloading the parameter data with the address data related to the identification ID in the second storage means 2.